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List of Latin legal terms
List of Latin legal terms
from Wikipedia

A number of Latin terms are used in legal terminology and legal maxims. This is a partial list of these terms, which are wholly or substantially drawn from Latin, or anglicized Law Latin.

Common law

[edit]
Term or phrase Literal translation Definition and use English pron
a fortiori from stronger An a fortiori argument is an "argument from a stronger reason", meaning that, because one fact is true, a second (related and included) fact must also be true. /ˌ fɔːrtiˈr, ˌ fɔːrʃiˈr/
a mensa et thoro from table and bed Divorce a mensa et thoro indicates legal separation without legal divorce. /ˌ ˈmɛnsə ɛt ˈθr/
a posteriori from later An argument derived after an event, having the knowledge about the event. Inductive reasoning from observations and experiments. /ˌ ˌpɒstrir/
a priori from earlier An argument derived before an event, without needing to have the knowledge about the event. Deductive reasoning from general principles. /ˌ prr/
a quo from which Regarding a court below in an appeal, either a court of first instance or an appellate court, known as the court a quo. /ˌ ˈkw/
ab extra from outside Concerning a case, a person may have received some funding from a 3rd party. This funding may have been considered ab extra. /ˌæb ˈɛkstrə/
ab initio from the beginning "Commonly used referring to the time a contract, statute, marriage, or deed become legal. e.g. The couple was covered ab initio by her health policy."[1] /ˌæb ɪˈnɪʃi/
absque hoc without this "Presenting the negative portion of a plea when pleading at common by way a special traverse."[1] /ˌæbskw ˈhɒk/
Actio non datur non damnificato An action is not given to one who is not injured. The requirement that in most private legal actions, the person bringing the action must have been damaged in some way.[2]
Actus legis nemini facit injurium The act of law injures no one.
Actus non facit reum, nisi mens sit rea No act is punishable that is not the result of a guilty mind. The prosecution in a criminal case must prove beyond a reasonable doubt, not only a criminal act, but also a certain level of a guilty mind (mens rea), specified in the criminal statute.[3]
actus reus guilty act Part of what proves criminal liability (with mens rea). /ˌæktəs ˈrəs/
ad coelum to the sky Abbreviated from Cuius est solum eius est usque ad coelum et ad infernos which translates to "[for] whoever owns [the] soil, [it] is his all the way [up] to Heaven and [down] to Hell." The principle that the owner of a parcel of land also owns the air above and the ground below the parcel. /ˌæd ˈsləm/
ad colligenda bona to collect the goods In cases of a disputed will, delay may endanger the assets of the deceased. Therefore, a court can give a person a writ of ad colligenda bona, which entitles them to collect and preserve the goods while their rightful owner is determined. Afterwards, that person will release the goods to the rightful owner.[4] /ˌæd ˌkɒlɪˈɛndə ˈbnə/
ad hoc for this Generally signifies a solution designed for a specific problem or task, non-generalizable, and not intended to be able to be adapted to other purposes. /ˌæd ˈhɒk/
ad hominem at the person Attempting to make a point of logic by attacking an opponent's character rather than answering their argument. /ˌæd ˈhɒmɪnɛm/
ad idem to the same thing In agreement. /ˌæd ˈdəm/
ad infinitum to infinity To continue forever. /ˌæd ɪnfɪˈntəm/
ad litem for the case Describes those designated to represent parties deemed incapable of representing themselves, such as a child or incapacitated adult. /ˌæd ˈltɛm/
ad quod damnum according to the harm Used in tort law. Implies that the reward or penalty ought to correspond to the damage suffered or inflicted.
ad valorem according to value /ˌæd vəˈlrɛm/
adjournment sine die adjournment without a day When an assembly adjourns without setting a date for its next meeting. /ˌsni ˈdi/
affidavit he has sworn A formal statement of fact. /ˌæfɪˈdvɪt/
allocatur it is allowed Generally, a statement from a court that a writ is allowed (i.e. granted); most commonly, a grant of leave to appeal by the Supreme Court of Pennsylvania, in reference to which the word is used equivalently to certiorari (q.v.) elsewhere. /ˌællktʊr/
alter ego another I A second identity living within a person. /ˌɒltər ˈiɡ/
Alteri stipulari nemo potest No-one can alter on their own a contract
amicus curiae friend of the court A person who offers information to a court regarding a case before it. /əˈmkəs ˈkjrii/
animus contrahendi contractual intent Intention to contract. /ˈænɪməs kɑːnˈtrəhɛndi/
animus manendi intention to remain The subjective intent to remain indefinitely in a place so as to establish it as one's permanent residence.[5] Along with actual residence, this is used to establish domicile.[6] Also called animus remanendi. See diversity of citizenship.
animus nocendi intention to harm The subjective state of mind of the author of a crime, with reference to the exact knowledge of illegal content of their behaviour, and of its possible consequences.
animus possidendi intention to possess "In order to claim possessory rights, an individual must establish physical control of the res and the intention to possess (i.e. animus possidendi)"[7]
animus revertendi intention to return "Wild animals, such as bees and homing pigeons, that by habit go 'home' to their possessor. Used when discussing ferae naturae."[7]
animus testandi testamentary intent The intention, when writing a document, that the document should serve as a last will and testament.[8]
ante before “An antenuptial agreement is a contract between two people that is executed before marriage.”
(in) arguendo for the sake of argument
bona fide in good faith Implies sincere good intention regardless of outcome. /ˈbnə ˈfdi/
bona vacantia ownerless goods
cadit quaestio the question falls Indicates that a settlement to a dispute or issue has been reached, and the issue is now resolved.
casus belli case of war The justification for acts of war. /ˈksəs ˈbɛl/
caveat May he beware When used by itself, refers to a qualification, or warning.
caveat emptor Let the buyer beware In addition to the general warning, also refers to a legal doctrine wherein a buyer could not get relief from a seller for defects present on property which rendered it unfit for use. /ˈkæviæt ˈɛmptɔːr/
certiorari to be apprised A type of writ seeking judicial review. /ˌsɜːrʃiəˈrr, ˌsɜːrʃiəˈrri/
cessante ratione legis cessat ipsa lex when the reason for a law ceases, so does the law itself Herbert Broom′s text of 1858 on legal maxims lists the phrase under the heading ″Rules of logic″, stating: Reason is the soul of the law, and when the reason of any particular law ceases, so does the law itself.[9]
ceteris paribus with other things the same More commonly rendered in English as "All other things being equal." /ˌsɛtərɪs ˈpærɪbəs/
compos mentis having command of mind Of sound mind. Also used in the negative "Non compos mentis", meaning "Not of sound mind". /ˈkɒmpɒs ˈmɛntɪs/
condicio sine qua non A condition without which it could not be An indispensable and essential action, condition, or ingredient.
consensus ad idem agreement to the same Meeting of the minds, mutual assent, or concurrence of wills. Parties must be of one mind and their promises must relate to the same subject or object[10] Also consensus in idem.
contra against Used in case citations to indicate that the cited source directly contradicts the point being made.
contra legem against the law Used when a court or tribunal hands down a decision that is contrary to the laws of the governing state.
contradictio in adjecto contradiction in adjective A contradiction where adjective contradicts its noun (e.g., a square triangle).
contra proferentem against the one bringing forth Used in contract law to stipulate that an ambiguous term in a contract shall be interpreted against the interests of the party that insisted upon the term's inclusion. Prevents the intentional additions of ambiguous terminology from being exploited by the party who insisted on its inclusion.
coram non judice before one who is not a judge Refers to a legal proceeding without a judge, or with a judge who does not have proper jurisdiction.
corpus delicti body of the crime A person cannot be convicted of a crime, unless it can be proven that the crime was even committed. /ˈkɔːrpəs dɪˈlɪkt/
corpus juris body of law The complete collection of laws of a particular jurisdiction or court. /ˈkɔːrpəs ˈrɪs/
corpus juris civilis body of civil law The complete collection of civil laws of a particular jurisdiction or court. Also sometimes used to refer to the Code of Justinian. /ˈkɔːrpəs ˈrɪs sɪˈvlɪs/
corpus juris gentium body of the law of nations The complete collection of international law.
corpus juris secundum An encyclopedia of US law drawn from US Federal and State court decisions.
crimen falsi crime of falsifying Forgery.
cui bono as a benefit to whom? Suggests that the perpetrator(s) of a crime can often be found by investigating those who would have benefited financially from the crime, even if it is not immediately obvious.
curia advisari vult the court wishes to consider Signifies the intent of a court to consider the points of law argued during advocacy, prior to judgement.
de bonis asportatis carrying goods away Specifies that larceny was taking place in addition to any other crime named. E.g. "trespass de bonis asportatis".
debellatio warring down Complete annihilation of a warring party, bringing about the end of the conflict.
de bonis non administratis of goods not administered Assets of an estate remaining after the death (or removal) of the designated estate administrator. An "administrator de bonis non administratis" will then be appointed to dispose of these goods.
de die in diem from day to day Generally refers to a type of labor in which the worker is paid fully at the completion of each day's work.
de facto in fact Literally "from fact"; often used to mean something that is true in practice, but has not been officially instituted or endorsed. "For all intents and purposes". Cf. de jure.
de futuro concerning the future At a future date.
de integro concerning the whole Often used to mean "start it all over", in the context of "repeat de integro".
de jure according to law Literally "from law"; something that is established in law, whether or not it is true in general practice. Cf. de facto.
de lege ferenda of the law as it should be Used in the context of "how the law should be", such as for proposed legislation.
de lege lata of the law as it is Concerning the law as it exists, without consideration of how things should be.
de minimis about the smallest things Various legal areas concerning small amounts or small degrees.
de minimis non curat lex the law is not concerned with minimal things The rule that the law will not remedy an injury that is minimal.[11]
de novo anew Often used in the context of "trial de novo" – a new trial ordered when the previous one failed to reach a conclusion.
deorum injuriae diis curae The gods take care of injuries to the gods Blasphemy is a crime against God, rather than against the State.
dictum (thing) said A statement given some weight or consideration due to the respect given the person making it.
doli incapax incapable of guilt Presumption that young children or persons with diminished mental capacity cannot form the intent to commit a crime.
dolus bonus Justinian Digest
dolus malus Justinian Digest
dolus specialis Specific deceit Heavily used in the context of genocide in international law.
domitae naturae tame by nature Tame or domesticated animal. Also called mansuetae naturae. Opposite of ferae naturae (below)
donatio mortis causa deathbed gift Gift causa mortis; "The donor, contemplating imminent death, declares words of present gifting and delivers the gift to the donee or someone who clearly takes possession on behalf of the donee. The gift becomes effective at death but remains revocable until that time."[7]
dramatis personae persons of the drama
duces tecum bring with you A "subpoena duces tecum" is a summons to produce physical evidence for a trial.
ejusdem generis of the same class Known as a "canon of construction", it states that when a limited list of specific things also includes a more general class, that the scope of that more general class shall be limited to other items more like the specific items in the list.
eo nomine by that name
erga omnes towards all Refers to rights or obligations that are owed towards all.
ergo therefore
erratum having been made in error
et al. and others Abbreviation of et alii, meaning "and others".
et cetera and other things Generally used in the sense of "and so forth".
et seq. and the following things Abbreviation of et sequens, meaning "and the following ones". Used in citations to indicate that the cited portion extends to the pages following the cited page.
et uxor and wife Usually used instead of naming a man's wife as a party in a case. /ˌɛt ˈʌksɔːr/
et vir and husband Usually used instead of naming a woman's husband as a party in a case. /ˌɛt ˈvɜːr/
ex aequo et bono of equity and [the] good Usually defined as "what is right and good." Used to describe the power of a judge or arbiter to consider only what is fair and good for the specific case, and not necessarily what the law may require. In courts, usually only done if all parties agree.
ex ante of before Essentially meaning "before the event", usually used when forecasting future events. /ˌɛks ˈænti/
ex cathedra from the chair Where chair refers to authority or position. Authority derived from one's position.
ex concessis from what has been conceded already Also known as "argument from commitment", a type of valid ad hominem argument.
ex delicto from a transgression The consequence of a crime or tort.
ex demissione from a transgression part of the title of the old action of ejectment
Jones v. Doe ex dem. Smith
Ex dolo malo non oritur actio No action arises from harm
ex facie on the face If a contract is blatantly and obviously incorrect or illegal, it can be considered void ex facie without any further analysis or arguments.
ex fida bona good business norms
ex gratia by favor Something done voluntarily and with no expectation of a legal liability arising therefrom.
ex officio from the office Something done or realized by the fact of holding an office or position.
ex parte from [for] one party A decision reached, or case brought, by or for one party without the other party being present.
ex post from after Based on knowledge of the past.
ex post facto from a thing done afterward Commonly said as "after the fact."
ex post facto law A retroactive law. E.g. a law that makes illegal an act that was not illegal when it was done.
ex proprio motu by [one's] own motion Commonly spoken as "by one's own accord."
ex rel [arising] out of the narration [of the relator] Abbreviation of ex relatione. Used when the government brings a case that arises from the information conveyed to it by a third party ("relator").
ex tempore At the time Referring to a decision delivered at the time of a hearing, rather than having the judgment reserved for a later date.
exempli gratia for the sake of example Usually abbreviated "e.g.".
ex tunc from then Term used in contract law to specify terms that are voided or confirmed in effect from the execution of the contract. Cf. ex nunc.
Ex turpi causa non oritur actio
ex nunc from now on Term used in contract law to specify terms that are voided or confirmed in effect only in the future and not prior to the contract, or its adjudication. Cf. ex tunc.
extant existing Refers to things that are currently existing at a given point, rather than things that are no longer so.
facio ut facias I do, that you may do A type of contract wherein one party agrees to do work for the other, in order that the second party can then perform some work for the first in exchange.
factum deed 1. an assured statement made; 2. completion of a will and all its parts to make it valid and legal; 3). book of facts and law presented in a Canadian court.
favor contractus favor of the contract A concept in treaty law that prefers the maintaining of a contract over letting it expire for purely procedural reasons.
felo de se felon of himself A suicide. This archaic term stems from English common law, where suicide was legally a felony, thus a person who committed suicide was treated as a felon for purposes of estate disposal.
ferae naturae wild animals by nature Wild animals residing on unowned property do not belong to any party in a dispute on the land. Opposite of domitae naturae (above).
fiat Let it be done. A warrant issued by a judge for some legal proceedings.
fieri facias May you cause to be done. A writ ordering the local law enforcement to ensure that damages awarded by the court are properly recovered. A writ of execution.
fortis attachiamentum, validior praesumptionem strong attachment, the stronger presumption When determining whether a chattel is a fixture: "size doesn't matter, how much or degree chattel is attached to 'land' and to 'what' "
forum non conveniens disagreeable forum A concept wherein a court refuses to hear a particular matter, citing a more appropriate forum for the issue to be decided. /ˈfrəm nɒn kənˈvniɛnz/
fumus boni iuris smoke of a good right Refers to having a sufficient legal basis to bring legal action.
functus officio having performed his office A person, court, statute, or legal document that has no legal authority, because its original legal purpose has been fulfilled.
gravamen things weighing down The basic element or complaint of a lawsuit. /ɡrəˈvmɛn/
guardian ad litem guardian for the case An independent party appointed in family law disputes to represent parties that cannot represent themselves, such as minors, developmentally disabled, or elderly.
habeas corpus May you have the body. A writ used to challenge the legality of detention. Orders the detaining party to "have the (living) body" of the detained brought before the court where the detention will be investigated. /ˈhbiəs ˈkɔːrpəs/
hostis humani generis enemy of the human race A party considered to be the enemy of all nations, such as maritime pirates.
imprimatur Let it be printed. An authorization for a document to be printed. Used in the context of approval by a religious body or other censoring authority.
in absentia in absence A legal proceeding conducted without the presence of one party is said to be conducted in absentia, e.g., trial in absentia or being sentenced in absentia.
in articulo mortis at the moment of death Often used in probate law, as well as for testimony in the sense of a dying declaration.
in camera in the chamber Conducted in private, or in secret. The opposite of in open court.
in curia in court Conducted in open court. The opposite of in camera.
in esse in existence Actually existing in reality. Opposite of in posse.
in extenso in the extended In extended form, or at full length. Often used to refer to publication of documents, where it means the full unabridged document is published.
in extremis in the extreme In extreme circumstances. Often used to refer to "at the point of death."
in flagrante delicto in blazing offense Caught in the actual act of committing a crime. Often used as a euphemism for a couple caught in the act of sexual intercourse, though it technically refers to being "caught in the act" of any misdeed.
in forma pauperis in the manner of a pauper Someone unable to afford the costs associated with a legal proceeding. As this will not be a barrier to seeking justice, such persons are given in forma pauperis status (usually abbreviated IFP), wherein most costs are waived or substantially reduced. /ɪn ˌfɔːrmə ˈpɔːpərɪs/
in futuro in the future Refers to things to come, or things that may occur later but are not so now. As in in futuro debts, i.e. debts which become due and payable in the future. /ɪn fjˈtjr/
in haec verba in these words Used when including text in a complaint verbatim, where its appearance in that form is germane to the case, or is required to be included.
in limine at the threshold A motion to a judge in a case that is heard and considered outside the presence of the jury.
in loco parentis in the place of a parent Used to refer to a person or entity assuming the normal parental responsibilities for a minor. This can be used in transfers of legal guardianship, or in the case of schools or other institutions that act in the place of the parents on a day-to-day basis. /ɪn ˌlk pəˈrɛntɪs/
in mitius in the milder A type of retroactive law that decriminalizes offenses committed in the past. Also known as an amnesty law.
in omnibus in all Used to mean "in every respect." Something applying to every aspect of a situation.
in pari delicto in equal offense Used when both parties to a case are equally at fault.
in pari materia in the same matter Refers to a situation where a law or statute may be ambiguous, and similar laws applying to the matter are used to interpret the vague one.
in personam in person Used in the context of "directed at this particular person", refers to a judgement or subpoena directed at a specific named individual. Cf. in rem.
in pleno in full
in propria persona in one's own person Said of one who represents themselves in court without the [official] assistance of an attorney.
in re in the matter [of] Used in the title of a decision or comment to identify the matter they are related to; usually used for a case where the proceeding is in rem or quasi in rem and not in personam (e.g. probate or bankrupt estate, guardianship, application for laying out a public highway) and occasionally for an ex parte proceeding (e.g. application for a writ of habeas corpus). /ɪn ˈr/
in rem about a thing Used in the context of a case against property, as opposed to a particular person. See also in rem jurisdiction. Cf. in personam. /ɪn ˈrɛm/
in situ in position Often used in the context of decisions or rulings about a property or thing "left in place" after the case as it was before. /ɪn ˈstj, ɪn ˈsɪtj/
in terrorem in order to frighten A warning or threat to sue, made in the hopes of convincing the other party to take action to avoid a lawsuit.
in terrorem clause clause "in order to frighten" A clause in a will that threatens any party who contests the will with being disinherited. Also called a no-contest clause.
in toto in total /ɪn ˈtt/
indicia indications Often used in copyright notices. Refers to distinctive markings that identify a piece of intellectual property.
infra below or under
iniuria sine damno injury without financial or property loss It was stated in Ashby v. White that the law makes a presumption of damage in the absence of actual perceptible damage or financial loss and that the infringement of a right was enough for iniuria sine damno to be actionable.[12] /ɪnˈjuːriə ˈsni ˈdæmn/
innuendo by nodding An intimation about someone or something, made indirectly or vaguely suggesting the thing being implied. Often used when the implied thing is negative or derogatory.
inter alia among others Used to indicate an item cited has been pulled from a larger or more complete list. /ˌɪntər ˈliə/
inter rusticos among rustics Refers to contract, debts, or other agreements made between parties who are not legal professionals.
inter se amongst themselves Refers to obligations between members of the same group or party, differentiated from the whole party's obligations to another party.
inter vivos between the living Refers to a gift or other non-sale transfer between living parties. This is in contrast to a will, where the transfer takes effect upon one party's death. /ˌɪntər ˈvvɒs/
intra within
intra fauces terrae within the jaws of the land This term refers to a nation's territorial waters.
intra legem within the law Used in various contexts to refer to the legal foundation for a thing.
intra vires within the powers Something done which requires legal authority, and the act is performed accordingly. Cf. ultra vires.
ipse dixit He himself said it. An assertion given undue weight solely by virtue of the person making the assertion. /ˈɪpsi ˈdɪksɪt/
ipsissima verba the very words Referring to a document or ruling that is being quoted by another.
ipso facto by the fact itself Used in the context that one event is a direct and immediate consequence of another. "In and of itself." /ˈɪps ˈfækt/
ipso jure the law itself By operation of law.
ius law For ius and various terms incorporating ius, see jus below and the relevant term incorporating jus
ius civile vigilantibus scriptum est civil law is written for the vigilant Noting that private law is written for those persons who are vigilant in pursuing their interests and diligently care for their own affairs.
jurat (He) swears Appears at the end of an affidavit, where the party making the affirmation signs the oath, and the information on whom the oath was sworn before is placed.
juris privati of private right Not clothed with a public interest.
jus law, right Essentially: law.
jus accrescendi right of survivorship Right of survivorship: In property law, on the death of one joint tenant, that tenant's interest passes automatically to the surviving tenant(s) to hold jointly until the estate is held by a sole tenant. The only way to defeat the right of survivorship is to sever the joint tenancy during the lifetime of the parties, the right of survivorship takes priority over a will or interstate accession rules.[7]
jus ad bellum laws to war Refers to legalities considered before entering into a war, to ensure it is legal to go to war initially. Not to be confused with ius in bello (q.v.), the "laws of war" concerning how war is carried out.
jus civile civil law A codified set of laws concerning citizenry, and how the laws apply to them.
jus cogens compelling law Internationally agreed laws that bear no deviation, and do not require treaties to be in effect. An example is law prohibiting genocide.
jus gentium law of nations Customary law followed by all nations. Nations being at peace with one another, without having to have an actual peace treaty in force, would be an example of this concept.
jus in bello law in war Laws governing the conduct of parties in war.
jus inter gentes law between the peoples Laws governing treaties and international agreements.
jus legationis right of legation The right to send and receive diplomatic representation
jus naturale natural law Laws common to all people, that the average person would find reasonable, regardless of their nationality.
jus primae noctis right of the first night Supposed right of the lord of an estate to take the virginity of women in his estate on their wedding night.
jus sanguinis right of blood Social law concept wherein citizenship of a nation is determined by having one or both parents being citizens. /ˈʌs ˈsæŋɡwɪnɪs/
jus soli right of soil Social law concept wherein citizenship of a nation is determined by place of birth. /ˈʌs ˈsl/
jus tertii law of the third Arguments made by a third party in disputes over possession, the intent of which is to question one of the principal parties' claims of ownership or rights to ownership.
Jus tractatuum
lacuna void, gap A situation arising that is not covered by any law, especially when related situations are covered by the law or where the situation appears to fall "between" multiple laws. Generally used in International Law, which is less comprehensive than most domestic legal systems.
lex communis common law Alternate form of jus commune. Refers to common facets of civil law that underlie all aspects of the law.
lex fori the law of the country in which an action is brought out
lex lata the carried law The law as it has been enacted.
lex loci the law of the place The law of the country, state, or locality where the matter under litigation took place. Usually used in contract law, to determine which laws govern the contract. /ˈlɛks ˈls/
lex scripta written law Law that specifically codifies something, as opposed to common law or customary law.
liberum veto free veto An aspect of a unanimous voting system, whereby any member can end discussion on a proposed law.
lingua franca the Frankish language A language common to an area that is spoken by all, even if not their mother tongue. Term derives from the name given to a common language used by traders in the Mediterranean basin dating from the Middle Ages.
lis alibi pendens lawsuit elsewhere pending Refers to requesting a legal dispute be heard that is also being heard by another court. To avoid possibly contradictory judgements, this request will not be granted.
lis pendens suit pending Often used in the context of public announcements of legal proceedings to come. Compare pendente lite (below).
locus place
locus delicti place of the crime Shorthand version of Lex locus delicti commissi. The "scene of the crime".
locus in quo the place in which The location where a cause of action arose.
locus poenitentiae place of repentance When one party withdraws from a contract before all parties are bound.
locus standi place of standing The right of a party to appear and be heard before a court. /ˈlkəs ˈstænd/
mala fide (in) bad faith A condition of being fraudulent or deceptive in act or belief.
malum in se wrong in itself Something considered a universal wrong or evil, regardless of the system of laws in effect.
malum prohibitum prohibited wrong Something wrong or illegal by virtue of it being expressly prohibited, that might not otherwise be so.
mandamus we command A writ issue by a higher court to a lower one, ordering that court or related officials to perform some administrative duty. Often used in the context of legal oversight of government agencies. /mænˈdməs/
mare clausum closed sea A body of water under the jurisdiction of a state or nation, to which access is not permitted, or is tightly regulated. /ˈmri ˈklɔːzəm/
mare liberum open sea A body of water open to all. Typically a synonym for International Waters, or in other legal parlance, the "High Seas".
mea culpa through my fault An acknowledgement of wrongdoing. /ˈm.ə ˈkul.pə/
mens rea guilty mind One of the requirements for a crime to be committed, the other being actus reus, the guilt act. This essentially is the basis for the notion that those without sufficient mental capability cannot be judged guilty of a crime. /ˈmɛns ˈrə/
modus operandi manner of operation A person's particular way of doing things. Used when using behavioral analysis while investigating a crime. Often abbreviated "M.O." /ˈmdəs ɒpəˈrænd, ˈmdəs ɒpəˈrændi/
mortis causa in contemplation of death Gift or trust that is made in contemplation of death.
mos pro lege custom for law That which is the usual custom has the force of law.
motion in limine motion at the start Motions offered at the start of a trial, often to suppress or pre-allow certain evidence or testimony.
mutatis mutandis having changed [the things that] needed to be changed A caution to a reader when using one example to illustrate a related but slightly different situation. The caution is that the reader must adapt the example to change what is needed for it to apply to the new situation.
ne exeat let him not exit [the republic] Shortened version of ne exeat republica: "let him not exit the republic". A writ to prevent one party to a dispute from leaving (or being taken) from the court's jurisdiction. /ˈn ˈɛksiæt/
Nemo dat quod non habet Nobody can give what he has not bankruptcy law
Nemo debet bis vexari (pro una et eadem causa) No-one should be tried twice (for one and the same charge) It is a principle of double jeopardy (autrefois acquit) where a person should not be tried twice on the same matter.
Nemo iudex in causa sua No-one should be a judge in his own case. It is a principle of natural justice that no person can judge a case in which they have an interest.
Nemo potest dare quod suum non est No one can give what he possesses not inter alia, see Dante on monarchy
Nemo potest esse tenens et dominus No one can at the same time be a tenant and a landlord Nor can one person covenant with himself and others jointly
Nemo potest mutare consilium suum in alterius iniuriam Nobody can change his own purpose to another's injury
Nemo potest nisi quod de jure potest A person can do only things, which s/he can do lawfully. Under law, a thing which cannot be lawfully performed is considered not within one's power.
Nemo potest praecise cogi ad factum Nobody can be forced to a specific act
Nemo potest venire contra factum proprium No-one can act in a way contrary to his own prior actions. doctrines of promissory estoppel and equitable estoppel; prohibited for a party to act in such a way that contradicts a previous act of his own on which the other party relied, thus causing a detriment to the latter.
Nemo potest facere per alium quod per se non potest No one can do through another what he cannot do himself.
nihil dicit He says nothing. A judgement rendered in the absence of a plea, or in the event one party refuses to cooperate in the proceedings.
nisi unless A decree that does not enter into force unless some other specified condition is met. /ˈns/
nisi prius unless first Refers to the court of original jurisdiction in a given matter. /ˈns ˈprəs/
nolle prosequi not to prosecute A statement from the prosecution that they are voluntarily discontinuing (or will not initiate) prosecution of a matter. /ˈnɒli ˈprɒsɪkw/
nolo contendere I do not wish to argue A type of plea whereby the defendant neither admits nor denies the charge. Commonly interpreted as "No contest." /ˈnl kɒnˈtɛndɪri/
non adimpleti contractus of a non-completed contract In the case where a contract imposes specific obligations on both parties, one side cannot sue the other for failure to meet their obligations, if the plaintiff has not themselves met their own.
non compos mentis not in possession of [one's] mind Not having mental capacity to perform some legal act
non constat It is not certain. Refers to information given by one who is not supposed to give testimony, such as an attorney bringing up new information that did not come from a witness. Such information is typically nullified.
non est factum It is not [my] deed. A method whereby a signatory to a contract can invalidate it by showing that his signature to the contract was made unintentionally or without full understanding of the implications.
non est inventus He was not found. Reported by a sheriff on writ when the defendant cannot be found in his county or jurisdiction.
non liquet It is not clear. A type of verdict where positive guilt or innocence cannot be determined. Also called "not proven" in legal systems with such verdicts.
non obstante verdicto notwithstanding the verdict A circumstance where the judge may override the jury verdict and reverse or modify the decision.
novus actus interveniens a new action coming between A break in causation (and therefore probably liability) because something else has happened to remove the causal link.
noscitur a sociis It is known by the company it keeps. An ambiguous word or term can be clarified by considering the whole context in which it is used, without having to define the term itself.
nota bene note well A term used to direct the reader to cautionary or qualifying statements for the main text.
Nullum crimen sine lege No-one can face punishment except for an act that was criminalized before he performed the act
Nulla poena sine culpa no punishment without fault One cannot be punished for something that they are not guilty of.
nudum pactum naked promise An unenforceable promise, due to the absence of consideration or value exchanged for the promise.
nulla bona no goods Notation made when a defendant has no tangible property available to be seized in order to comply with a judgement.
nunc pro tunc now for then An action by a court to correct a previous procedural or clerical error.
obiter dictum a thing said in passing In law, an observation by a judge on some point of law not directly relevant to the case before him, and thus neither requiring his decision nor serving as a precedent, but nevertheless of persuasive authority. In general, any comment, remark or observation made in passing.
omnia praesumuntur rite essa acta Everything is presumed right about this act When reviewing official acts, the presumption that all formalities were complied with.
onus probandi Burden of proof.
ore tenus (evidence) presented orally
pace with peace Used to say 'contrary to the opinion of.' It is a polite way of marking a speaker's disagreement with someone or some body of thought. /ˈpɑː/
par delictum equal fault Used when both parties to a dispute are at fault.
parens patriae parent of the nation Refers to the power of the State to act as parent to a child when the legal parents are unable or unwilling.
pari passu on equal footing Equal ranking, equal priority (usually referring to creditors).
partus sequitur ventrem Offspring follows the belly Legal status of children of slaves is the same as their mother's.
pendente lite while the litigation is pending Court orders used to provide relief until the final judgement is rendered. Commonly used in divorce proceedings. The adverbial form of lis pendens (above).
per capita by head Dividing money up strictly and equally according to the number of beneficiaries
per contra by that against Legal shorthand for "in contrast to".
per curiam through the court A decision delivered by a multi-judge panel, such as an appellate court, in which the decision is said to be authored by the court itself, instead of situations where those individual judges supporting the decision are named. /ˌpɜːr ˈkjriæm/
per incuriam by their neglect A judgement given without reference to precedent.
per minas through threats Used as a defense, when illegal acts were performed under duress.
per proxima amici by or through the next friend Employed when an adult brings suit on behalf of a minor, who was unable to maintain an action on his own behalf at common law.
per quod by which Used in legal documents in the same sense as "whereby". A per quod statement is typically used to show that specific acts had consequences which form the basis for the legal action.
per se by itself Something that is, as a matter of law.
per stirpes by branch An estate of a decedent is distributed per stirpes, if each branch of the family is to receive an equal share of an estate.
periculum in mora danger in delay A condition given to support requests for urgent action, such as a protective order or restraining order.
persona non grata unwelcome person A person who is officially considered unwelcome by a host country in which they are residing in a diplomatic capacity. The person is typically expelled to their home country. /pərˈsnə nɒn ˈɡrɑːtə, pərˈsnə nɒn ˈɡrtə/
posse comitatus power of the county A body of armed citizens pressed into service by legal authority, to keep the peace or pursue a fugitive. /ˈpɒsi ˌkɒmɪˈttəs/
post hoc ergo propter hoc after this, therefore because of this A logical fallacy that suggests that an action causes an effect simply because the action occurred before the effect.
post mortem after death Refers to an autopsy, or as a qualification as to when some event occurred.
post mortem auctoris after the author's death Used in reference to intellectual property rights, which usually are based around the author's lifetime.
postliminium return from the other Refers to the return of legal standing and property of a person who returns to the jurisdiction of Rome
praetor peregrinus magistrate of foreigners The Roman praetor (magistrate) responsible for matters involving non-Romans.
prima facie at first face A matter that appears to be sufficiently based in the evidence as to be considered true. /ˈprmə ˈfʃii/
pro bono for good Professional work done for free. /ˈpr ˈbn/
pro bono publico for the public good /ˈpr ˈbn ˈpʌblɪk/
pro forma as a matter of form Things done as formalities.
pro hac vice for this turn Refers to a lawyer who is allowed to participate (only) in a specific case, despite being in a jurisdiction in which he has not been generally admitted.
pro per abbreviation of propria persona, meaning "one's own person" Representing oneself, without counsel. Also known as pro se representation.
pro rata from the rate A calculation adjusted based on a proportional value relevant to the calculation. An example would be a tenant being charged a portion of a month's rent based on having lived there less than a full month. The amount charged would be proportional to the time occupied.
pro se for himself Representing oneself, without counsel. Also known as pro per representation. /ˌpr ˈs, ˌpr ˈs/
pro tanto for so much A partial payment of an award or claim, based on the defendant's ability to pay.
pro tem abbreviation of pro tempore, meaning "for the time being" Something, such as an office held, that is temporary.
pro tempore for the time being Something, such as an office held, that is temporary.
propria persona proper person Refers to one representing themselves without the services of a lawyer. Also known as pro per representation.
qua which; as In the capacity of.
quae ipso usu consumuntur Consumed by the use itself Used in relation with objects whose purpose is to be consumed or destroyed. Examples include food, fuel, medicine, matches or money.[13]
quaeritur It is sought. The question is raised. Used to declare that a question is being asked in the following verbiage.
quaere query Used in legal drafts to call attention to some uncertainty or inconsistency in the material being cited.
quantum how much
quantum meruit as much as it deserves; as much as she or he has earned[10] In contract law, a quasi-contractual remedy that permits partial reasonable payment for an incomplete piece of work (services and/or materials), assessed proportionately, where no price is established when the request is made.[10]

In contract law, and in particular the requirement for consideration, if no fixed price is agreed upon for the service and/or materials, then one party would request a reasonable price for the said services and/or materials at the end of the job. A common example would be a plumber requested to fix a leak in the middle of the night.[10]

quantum valebant as much as they were worth Under Common Law, a remedy to compute reasonable damages when a contract has been breached – the implied promise of payment of a reasonable price for goods.
In contract law, for requirements of consideration, reasonable worth for goods delivered.
Usage: quantum meruit has replaced quantum valebant in consideration;[10] in the case of contract remedy, quantum valebant is being used less, and could be considered obsolete.
quasi as if Resembling or being similar to something, without actually being that thing.
qui tam abbreviation of qui tam pro domino rege quam pro se ipso in hac parte sequitur, meaning "who pursues in this action as much for the king as himself". In a qui tam action, one who assists the prosecution of a case is entitled to a proportion of any fines or penalties assessed.
quid pro quo this for that An equal exchange of goods or services, or of money (or other consideration of equal value) for some goods or services.
quo ante as before Returning to a specific state of affairs which preceded some defined action.
quo warranto by what warrant A request made to someone exercising some power, to show by what legal right they are exercising that power. A type of writ.
quoad hoc as to this Used to mean "with respect to" some named thing, such as when stating what the law is in regards to that named thing.
R Rex or Regina King or Queen. In British cases, will see R v Freeman meaning Regina against Freeman. Changes with King or Queen on throne.
ratio decidendi reason for the decision The point in a legal proceeding, or the legal precedent so involved, which led to the final decision being what it was.
ratio scripta written reason The popular opinion of Roman law, held by those in the Medieval period.
rationae soli by reason of the soil "Certain rights may arise by virtue of ownership of the soil upon which wild animals are found."[7]
rebus sic stantibus things thus standing A qualification in a treaty or contract, that allows for nullification in the event fundamental circumstances change.
reddendo singula singulis referring solely to the last The canon of construction that in a list of items containing a qualifying phrase at the end, the qualifier refers only to the last item in the list.
res thing, matter, issue, affair
res communis common to all Property constructs like airspace and water rights are said to be res communis – that is, a thing common to all, and that could not be the subject of ownership. With airspace, the difficulty has been to identify where the fee simple holder's rights to the heavens end. Water is a bit more defined – it is common until captured.[7]
res derelictae abandoned goods Material property abandoned by its owner
res ipsa loquitur the thing speaks for itself The principle that the occurrence of an accident implies negligence. This principle allows the elements of duty of care, breach, and causation to be inferred from an injury that does not ordinarily occur without negligence.
res gestae a thing done Differing meaning depending on what type of law is involved. May refer to the complete act of a felony, from start to finish, or may refer to statements given that may be exempt from hearsay rules.
res judicata a matter judged A matter that has been finally adjudicated, meaning no further appeals or legal actions by the involved parties is now possible. /ˈrz dɪˈktə, ˈrz, dɪˈkɑːtə/
res nova a new thing A question of law on which no court has previously ruled, or a factual situation about which no court has previously ruled; a legal case without a precedent
res nullius nobody's thing Ownerless property or goods. Such property or goods are able and subject to being owned by anybody.
res publica public affair All things subject to concern by the citizenry. The root of the word republic.
respondeat superior Let the master answer. A concept that the master (e.g. employer) is responsible for the actions of his subordinates (e.g. employees).
scandalum magnatum scandal of the magnates Defamation against a peer in British law. Now repealed as a specific offense.
scienter knowingly Used when offenses or torts were committed with the full awareness of the one so committing.
scire facias Let them know. A writ, directing local officials to officially inform a party of official proceedings concerning them.
scire feci I have made known. The official response of the official serving a writ of scire facias, informing the court that the writ has been properly delivered.
secundum formam statuti According to the form of the statute.
se defendendo self-defense The act of defending one's own person or property, or the well-being or property of another.
seriatim in series Describes the process in which the court hears assorted matters in a specific order. Also refers to an occasion where a multiple-judge panel will issue individual opinions from the members, rather than a single ruling from the entire panel.
sine die without day Used when the court is adjourning without specifying a date to re-convene. See also adjournment sine die.
sine qua non without which, nothing Refers to some essential event or action, without which there can be no specified consequence.
situs the place Used to refer to laws specific to the location where specific property exists, or where an offense or tort was committed.
stare decisis to stand by [things] decided The obligation of a judge to stand by a prior precedent. /ˈstri dɪˈssɪs/
status quo
status quo ante
statu quo
the state in which In contract law, in a case of innocent representation, the injured party is entitled to be replaced in statu quo. Note the common usage is status quo from the Latin status quo ante, the "state in which before" or "the state of affairs that existed previously."[10]
stratum a covering, from neuter past participle of sternere, to spread 1) In property law, condominiums has said to occupy stratum many stories about the ground.[7]
2) Stratum can also be a societial level made up of individuals with similar status of social, cultural or economic nature.
3) Stratum can refer to classification in an organized system along the lines of layers, levels, divisions, or similar grouping.
sua sponte of its own accord Some action taken by the public prosecutor or another official body, without the prompting of a plaintiff or another party. (compare ex proprio motu, ex mero motu which are used for courts).
sub judice under the judge Refers to a matter currently being considered by the court.
sub modo subject to modification Term in contract law that allows limited modifications to a contract after the original form has been agreed to by all parties.
sub nomine under the name Abbreviated sub nom.; used in case citations to indicate that the official name of a case changed during the proceedings, usually after appeal (e.g., rev'd sub nom. and aff'd sub nom.)
sub silentio under silence A ruling, order, or other court action made without specifically stating the ruling, order, or action. The effect of the ruling or action is implied by related and subsequent actions, but not specifically stated.
subpoena under penalty A writ compelling testimony, the production of evidence, or some other action, under penalty for failure to do so.
subpoena ad testificandum under penalty to be witnessed An order compelling an entity to give oral testimony in a legal matter.
subpoena duces tecum bring with you under penalty An order compelling an entity to produce physical evidence or witness in a legal matter.
suggestio falsi false suggestion A false statement made in the negotiation of a contract.
sui generis of its own kind/genus Something that is unique amongst a group.
sui juris of his own right Refers to one legally competent to manage his own affairs. Also spelled sui iuris.
suo motu of its own motion Refers to a court or other official agency taking some action on its own accord (synonyms: ex proprio motu, ex mero motu). Similar to sua sponte.
supersedeas refrain from A bond tendered by an appellant as surety to the court, requesting a delay of payment for awards or damages granted, pending the outcome of the appeal.
suppressio veri suppression of the truth Willful concealment of the truth when bound to reveal it, such as withholding details of damage from an auto accident from a prospective buyer of the car in that accident.
supra above Used in citations to refer to a previously cited source.
terra nullius no one's land Land that has never been part of a sovereign state, or land which a sovereign state has relinquished claim to.
trial de novo trial anew A completely new trial of a matter previously judged. It specifically refers to a replacement trial for the previous one, and not an appeal of the previous decision.
trinoda necessitas three-knotted need Refers to a threefold tax levied on Anglo-Saxon citizens to cover roads, buildings, and the military.
uberrima fides most abundant faith Concept in contract law specifying that all parties must act with the utmost good faith.
ubi eadem ratio, ibi idem jus where there is the same reason there is the same law;[14] like reason doth make like law.[15] See the judgment of Lord Holt CJ in Ashby v White.
ubi jus ibi remedium wherever a right exists there is also a remedy See the judgment of Lord Holt CJ in Ashby v White.[16][17] Some legal scholars find it reflected in the Due Process Clause of the Fourteenth Amendment to the United States Constitution.[18]
ultra vires beyond the powers An act that requires legal authority to perform, but which is done without obtaining that authority.
universitas personarum totality of people Aggregate of people, body corporate, as in a college, corporation, or state
universitas rerum totality of things Aggregate of things.
uno flatu in one breath Used to criticize inconsistencies in speech or testimony, as in: one says one thing, and in the same breath, says another contradictory thing.
uti possidetis as you possess Ancient concept regarding conflicts, wherein all property possessed by the parties at the conclusion of the conflict shall remain owned by those parties unless treaties to the contrary are enacted.
uxor wife Used in documents in place of the wife's name. Usually abbreviated et ux.
vel non or not Used when considering whether some event or situation is either present or it is not.
veto forbid The power of an executive to prevent an action, especially the enactment of legislation.
vice versa the other way around Something that is the same either way.
vide see Used in citations to refer the reader to another location.
videlicet contraction of videre licet, meaning "it is permitted to see" Used in documents to mean "namely" or "that is". Usually abbreviated viz.
viz. abbreviation of videlicet Namely.
vigilantibus non dormientibus iura subveniunt The laws benefit those who are vigilant rather than those who sleep.

Civil law

[edit]
Term or phrase Literal translation Definition and use English pron
accessio something added Accession, i.e. mode of acquisition by creation in which labor and other goods are added to property in such a manner that the identity of the original property is not lost (vs. commixtio, specificatio)
accidentalia negotii business incidentals Ancillary terms and conditions; express contractual terms that are purely voluntary, optional, and not necessitated by the contract's subject matter. Also called incidentalia (Roman-Dutch law). One of three types of contractual terms, the others being essentialia negotii 'core terms' and naturalia negotii 'implied terms'.
actus iuridicus legal act 1. In French-law-based systems, refers only to those sources of subjective law that are human-made and voluntary (vs. factum iuridicum); 2. In German-law-based systems, encompasses all sources of subjective law, be they human-made or not, voluntary or not. See also negotium iuridicum.
ad quantitatem by the quantity itemized, e.g. sale ad quantitatem = item sale (e.g. 100 carp, 10,000 lbs. of sugar, 10 casks of corn) (vs. per aversionem)
aditio hereditatis hereditary approach Entering into the inheritance, i.e. vesting of the inheritance in an heir or will beneficiary. See delatio hereditatis.
aliquid novi something new The new element or aspect of a novation (vs. idem debitum). Also known as novum.
casum sentit dominus accident is felt by the owner The owner who has to assume the risk of accidental harm to him or accidental loss to his property.
casus fortuitus fortuitous event Force majeure arising from a human-made inevitable accident (e.g. riots, strikes, civil war); ex: When H.M.S. Bounty was destroyed by Hurricane Sandy, October 29, 2012, casus fortuitus would describe the H.M.S. Bounty being at the wrong place when Hurricane Sandy came up the coast.HMS Bounty Sinks Compare vis maior (see below).
cautio de restituendo guarantee to reinstate Security or guarantee that heirs must provide in a case where an absent person's estate is divided among them (insurance law)
cessio yielding Assignment, that is, the transfer of rights or benefits.
collatio bonorum bringing together of goods Hotchpot. Also called collatio inter liberos (Scots law).
commixtio commingling Confusion, i.e. acquisition by creation in which fungible solid or liquid goods (and no labor) of different owners intermingle in such a way that the mixture creates a new thing and can no longer be separately identified, it is owned by the owners in co-ownership (vs. accessio, specificatio)
commodatum accommodation Loan for use, i.e. bailment of movable property that is not perishable or consumable to be returned without payment. Parties:
  • commodans 'lender'
  • commodatarius 'borrower'
communio bonorum community of goods The aggregate of marital property (or marital estate) under a community property matrimonial regime.
compensatio balancing of accounts Set-off. Type: compensatio lucri cum damno - set-off of profit and loss
compensatio morae balance of delay Delay in payment or performance on the part of both the debtor and the creditor.
confusio melting together Merger of counterparty rights in the same person (e.g. debtor-creditor, buyer-seller, landlord-tenant, etc.), thereby extinguishing an obligation or right. Adverb: confusione.
conjunctissimus the most joined Next-of-kin. Plural conjunctissimi.
contra bonos mores against good morals Contracts so made are generally illegal and unenforceable.
culpa guilt Unintentional negligence (in tort). Degrees:
  • culpa lata - gross negligence
  • culpa levis - ordinary negligence
  • culpa levissima - slight negligence
cum beneficio inventarii under benefit of inventory As in an heir cum beneficio inventarii, who accepts his/her share in a deceased's estate after having had an appraisal and estate inventory drawn up, thereby separating their share from the whole and limiting their liability.
cum onere with burdens (Louisiana law) as encumbered, i.e. alienated with the encumbrances running with the land.
cura guardianship Curatorship, i.e. legal guardianship under which the ward is totally and permanently incapable. Compare tutela. Parties are:
  • curandus - ward
  • curator - guardian (see below)
curator guardian Guardian under a curatorship (cura). Types are:
  • curator ad litem - guardian ad litem
  • curator bonis - guardian of the property
  • curator personae - guardian of the person
damnum emergens emergent loss Loss actually incurred because of a contractual breach
damnum et interesse damage and interests Tortious damages, damages in tort
data certa certain date Fixed effective date of a contract, i.e. one that cannot be ante- or post-dated
datio in solutum giving in payment Species of accord and satisfaction by transfer or assignment of property in lieu of money; kind of in-kind payment, as opposed to a money payment
de cujus (s)he for whom... The deceased, decedent. Short for de cujus successione agitur.
delatio hereditatis hereditary transferral Falling open of succession. See aditio hereditatis.
domicilium citandi et executandi domicile for summoning and carrying out Address for service or notices (e.g. for contractual purposes).
dominium plurium in solidum plural, joint and several ownership Joint tenancy.
dominium pro parte pro indiviso unpartitioned and undivided ownership Tenancy in common. The types are:
  • communio pro indiviso (aka communio pro partibus indivisis) - unilaterally partitionable
    • communio incidens - arising by operation of law, e.g. indivision (succession), party walls, common areas of a condominium
    • communio voluntaria - arising by agreement, e.g. marital estate (community property), company/partnership property
  • communio pro diviso - all parties must agree to partition
dominus litis master of the case Litigant, the client in a lawsuit, as opposed to the lawyer.
error in iudicando error in judgment (in court) Error of fact and reasoning (vs. error in procedendo)
error in procedendo procedural error (in court) Error on a point of law or procedure (vs. error in iudicando)
essentialia negotii business essentials Express or implied contractual terms that are required either by law or by the contract's subject matter. One of three types of contractual terms, the others being accidentialia negotii and naturalia negotii.
ex intervalo temporis Not all at once, in parts (vs. uno contextu).
ex propriis sensibus with one's own senses Used for firsthand testimony, e.g. testimony ex propriis sensibus (vs. per relationem).
factum iuridicum legal fact In French-law-based systems, refers to those sources of subjective law that are either not human-made or human-made but involuntary (vs. actus iuridicus).
falsus procurator fake agent Agent de son tort, officious agent
fideicommissum entrusting to (a person's) good faith. Testamentary trust; a form of substitution (called 'fideicommissary substitution') in which a will beneficiary is instructed in the will to transfer the testamentary gift in whole or part to a third party. A fideicommissum is created either expressly in a will or impliedly through a si sine liberis decesserit clause or through a prohibition against alienation in the will.[19]
fideiussio Suretyship.
fructus industriales industrial fruits Emblements; in property law, a co-owner profiting from her or his fructus industriales is solely responsible for any losses that my occur.[7] (vs. fructus naturales, see below).
fructus naturales natural fruits Vegetation naturally growing from old roots (as pasturage) or from trees (as timber or fruit) (vs. fructus industriales, see above).
hereditas iacens lying inheritance Estate of inheritance before vesting in heirs
heres Heir. Plural heredes. Types:
  • heredes proximi - closest heirs
  • sui heredes necessarii - forced heirs (singular suus heres necessarius)
hypotheca Mortgage
idem debitum same debt The element or aspect of the novation that does not change (vs. aliquid novi)
in casu in the case In the instant case; used when referring to the matter before the court in a case being discussed
in solidum for the whole Jointly and severally; short for singuli et in solidum. Where a group of persons share liability for a debt, such as co-signers to a loan, the debtor can sue a single party in solidum, that is jointly and severally, to recover the entire amount owed.
inaedificatio building Attachment of movables to land, accession by building
inaudita altera parte without hearing the other party Equivalent of common law ex parte, especially in the context of submitting a motion, brief, or obtaining relief as fast as possible
incapax incapable (Scots law) person not having capacity (mental, legal, or otherwise). [ɪnˈkapaks]
indignus (heres) unworthy heir Unworthy beneficiary or heir, who is precluded from inheriting because his conduct makes him unworthy, in a legal sense, to take in the deceased's estate.
infans infant (Roman-Dutch law) child of 7 years or younger and who therefore has very limited legal capacity. Plural infantes. [ˈinˌfanz]
invecta et illata brought in and carried out Tenant's things brought into the leased premises for his/her temporary use
iudex ad quem Appellate court or court of last resort (vs. iudex a quo)
iudex a quo Lower court from which an appeal originates; originating court (vs. iudex ad quem)
iura novit curia the court knows the law The principle that the parties to a legal dispute do not need to plead or prove the law that applies to their case.
ius accrescendi right of accrual (Civil law) Accretion, i.e. right of a will beneficiary to succeed proportionately to a testamentary gift that another beneficiary in the same will cannot or does not want to take.
ius commune common law Not actually referring to common law; this term refers to common doctrine and principles of civil law that underlie all aspects of civilian legal systems and that formed the basis of medieval Roman law.
ius persequendi right of following Right of pursuit, i.e. the creditor's right to pursue a debt that runs with the land into the hands of a bona fide purchaser
ius praeferendi right of preferring Priority right or preferential right, i.e. a creditor's right to rank higher relative to another
ius quaesitum tertio right to third-party relief Right of a third-party beneficiary to sue in order to enforce a third-party contract, i.e. the opposite of privity of contract.
ius retentionis right of retaining Lien (possessory)
ius variandi right of varying Free choice of court actions where concurrent actions lie, e.g. tort and criminal, or tort and breach of contract.
laesio enormis unusual injury Lesion, i.e. excessive loss or injury used as grounds for setting aside a contract. Lesion beyond moiety (laesio ultra dimidium) is the standard in French-law-based systems; sold for less than half its value or purchased for more than double.
lex commissoria cancelling law Forfeiture clause for nonperformance of a contract, especially (1) a provision that a pledge shall be forfeited if a loan is defaulted, or (2) a condition that money paid on a contract of sale shall be forfeited and the sale rescinded if outstanding payments are defaulted. Also known as a pactum commissorium.
liberandi causa liberating cause As in 'prescription liberandi causa', i.e. liberative prescription (aka extinctive prescription), which is the civilian equivalent of a statutory limitation period.
locatio conductio leasing (and) hiring Hire or rental. Types:
  • locatio conductio operarum - employment, indentured servitude, and master/slave relationship
  • locatio conductio operis - hire of service provider or independent contractor
  • locatio conductio rei - rental or letting of property
lucrum cessans ceasing profit Prospective damages or loss of profits that would, because of the contractual breach, have been made in the future
mandatum mandate Bilateral agreement for direct representation between a principal and agent. Compare procuratio. Parties:
  • mandatarius 'agent'
  • mandator 'principal'
monstrum monster Child born with severe deformities. Plural monstra.
mora accipiendi delay of the one receiving Delay in payment or performance on the part of the creditor or obligor. Also known as mora creditoris.
mora solvendi delay of the one paying Delay in payment or performance on the part of the debtor or the obligee. Also known as mora debitoris. 2 forms:
  • mora solvendi ex re - delay in giving or delivering a thing;
  • mora solvendi ex personae - delay in obligations to do or perform personal service.
mutuum loan Loan for consumption, i.e. bailment of fungible movable property that is to be returned in kind in the same quantity and quality. Parties:
  • mutuum dans (aka mutuans) 'lender'
  • mutuum accipiens (aka mutuarius) 'borrower'
naturalia negotii business naturals Express or implied contractual terms that go to the root of a contract's subject matter. One of three types of contractual terms, the others being accidentialia negotii and essentalia negotii.
nec vi, nec clam, nec precario Without force, without secrecy, without permission Peacefully, openly, and with the intention to acquire ownership; applies to acquisitive prescription
negotiorum gestio management of affairs Quasi-contractual obligation arising from benevolent or necessitous intermeddling, obliging the benefited party (dominus negotii) to reimburse the intermeddler (gestor) for the cost that was used in doing good works.
negotium iuridicum legal business 1. In French-law-based systems, refers to the legal operation, activity, or fact embodied or memorialized by a legal instrument (as opposed to the instrument itself, known as an instrumentum); 2. In German-law-based systems, refers to a transactional act, the main sub-type of legal acts. See also actus iuridicus.
non bis in idem not twice in the same Prohibition against double jeopardy. A legal action cannot be brought twice for the same act or offense. [nɔnbisinidɛm]
novum iudicium new judgment Appeal by way of hearing de novo, i.e. the case is retried with no restrictions of scope: errors of law are reviewed and new findings of fact are made. (vs. revisio prioris instantiae)
nudum praeceptum naked precept If a testator places a prohibition on a testamentary gift but fails to say what should happen to the gift if the prohibition is contravened, the prohibition is said to be 'nude', i.e. a nudum praeceptum. In other words, the prohibition is of no effect, and the beneficiary will take the gift free from any restrictions.
pactum de contrahendo agreement to contract Prior contract aimed at concluding another contract, known as the parent or principal contract. Includes binders (in real estate sales), such as a purchase offer or an option to sell.
pactum de non cedendo agreement to not yield Anti-assignment clause
pactum de non petendo (in anticipando) agreement to not sue Agreement in which one party agrees not to sue the other.
pactum de retrovendendo agreement to sell back Contract of sale with right of repurchase
pactum reservati dominii agreement of reserved owners Reservation of title
pactum successorium inheritance agreement Bilateral contract concerning succession, usually made between a potential testator (future decedent) and his/her heir. Plural pacta successoria. The most common forms are:
  • pactum renunciativum (aka pactum de non succedendo) - (contractual) disclaimer of interest
  • pactum acquisitivum (aka pactum conservandae successionis) - (contractual) deed of variation
  • pactum de hereditate tertii viventis - family settlement agreement.
pars dominii ownership part The major interests in the bundle of rights making up ownership. In French-based systems there are three, being usus (aka ius utendi), fructus (aka ius fruendi), and abusus (aka ius abutendi). In German-based systems there are more, usually ius possidendi ‘owner’s right to possess’, ius utendi fruendi ‘right of use and enjoyment’, ius abutendi ‘right to consume’, ius disponendi ‘right of disposal’, ius prohibendi ‘right of exclusion’, and ius vindicandi ‘right to recover or reclaim’.
paterfamilias father of the family The head of household, for purposes of considering the rights and responsibilities thereof. (Civil law) bonus paterfamilias: a standard of care equivalent to the common law ordinary reasonable man. Other degrees of care are:
  • diligens paterfamilias - higher standard of care, greater diligence;
  • diligentissimus paterfamilias - highest standard of care, utmost diligence.
penitus extraneus outside penitent Incidental beneficiary or any outside party to a third-party contract (see stipulatio alteri). Plural penitus extranei.
per aversionem by turning away (1) description, whereby the surrounding property is used to provide the legal description of the boundaries of the property; (2) sale per aversionem = bulk sale (a flock of sheep for $100 - the number of sheep are uncounted) (vs. ad quantitatum)
per relationem by relation Hearsay; used for secondhand, indirect evidence, e.g. testimony per relationem 'hearsay testimony' (vs. ex propriis sensibus). Also called de auditu.
pignus pledge Pledge, i.e. a possessory security interest
pleno iure by full right Self-executing, without need of a court order or judicial proceedings; with full right or authority. Ex: null pleno iure.
plus quam tolerabile more than tolerable Excessive, intolerable; in reference to a nuisance or some other violation of neighbor law.
praedium estate Landed property, tenement of land, especially with respect to an easement (servitude). 2 types:
  • praedium dominans - dominant estate (aka dominant tenement)
  • praedium serviens - servient estate (aka servient tenement)
praeemptio previous purchase Right of first refusal
praesumptio presumption Legal presumption. Types:
  • praesumptio iuris tantum - rebuttable presumption
  • praesumptio iuris et de iure - irrebuttable or conclusive presumption
praesumptio innocentiae Presumption of innocence
praesumptio veritatis et solemnitatis presumption of truth and solemnity Presumption of regularity, which attaches to public instruments admissible to prove the truth of their contents.
pretium pro doloribus price for pain Solatium.
prior tempore potior iure earlier in time, stronger in law (Scots law, civil law), usually translated as "prior in time, superior in right", the principle that someone who registers (a security interest) earlier therefore ranks higher than other creditors.
probatio Evidence (admissible in a court of law), especially documentary evidence. Types:
  • adminiculum (probationis) 'adminicular evidence' - evidence adduced in aid or support of other evidence, which without it is imperfect
  • semiplena probatio, probatio semiplena 'half proof, imperfect proof' - executed in presence of 1 or no witnesses; includes private instruments
  • plena probatio, probatio plena 'full proof, perfect proof' - executed in presence of 2 witnesses; includes public instruments
  • probatio probatissima - the highest evidence, referring to testimony under oath (received into common law but not civil law)
procuratio management Power of attorney, i.e. a unilateral grant of indirect representation by a principal to an attorney-in-fact. Compare mandatum.
procurator Agent, attorney-in-fact. Types:
  • procurator ad causas - attorney employed to assist a litigant in the conduct of his lawsuit
  • procurator ad negotia - attorney assisting his client in transacting other business
  • procurator in rem suam - holder of an irrevocable power of attorney
quaestus liberales Liberal profession
restitutio in integrum total reinstatement (1) Restoration of something, such as a building or damaged property, to its original condition.
(2) In contract law, when considering breach of contract and remedies, to restore a party to an original position.[10]
revisio prioris instantiae review of the court below Appeal by way of re-hearing or pure appeal (aka appeal stricto sensu); the scope is limited to errors of law and no new factual findings are possible; the case is traditionally remitted to the originating court below for re-judgment. (vs. novum iudicium)
salva rei substantia the thing's substance intact Limitation on how a fiduciary can use the fideicommissary assets; ultimately they must maintain their essential quality until transferred to the fideicommissary.[19] Plural salva rerum substantia. See fideicommissum.
servitus servitude, subjugation Servitude, i.e. an easement. Plural servitutes.
si sine liberis decesserit if (he) should depart without children Certain type of clause in a will creating a fideicommissum by imposing a condition on the will beneficiary that if (s)he dies childless, the testamentary gift will transfer to a third party. Ex: If A dies childless after my death, the farm must go to B.[19] See fideicommissum.
solarium area exposed to sunlight Ground rent for a surface right or estate (superficies).
solutio indebiti performance of something not due Undue performance or payment, obliging the enrichee (accipiens) to return the undue payment or compensate the impoverishee (solvens) for the undue performance
specificatio Specification, i.e. mode of acquisition by creation wherein something new is made by adding labor (manufacturing) to property, and the non-reducible parts used for its fabrication lose their identity (vs. accessio, commixtio). The new thing is called nova species.
spei emptio, emptio spei sale of hope Sale of a chance, hope, or expectancy
spes futurae actionis hope of future action Future or contingent right of action
spes successionis hope of succession Expectancy (of heirship)
spoliatio plundering Spoliation, i.e. act of unlawful dispossession of corporeal property. Parties:
  • spoliatus - aggrieved party
  • spoliator - dispossessor
stante matrimonio During the marriage
stipulatio alteri another's (contractual) provision Third-party contract. Also known as pactum in favorem tertii (German-law-based systems). The parties are:
superficies surface Surface right, surface estate. Parties:
  • dominus soli 'subsurface owner, mineral owner'
  • superficiarius 'surface owner'
tantum et tale thus and such (Scots law) "as is", to disclaim implied warranties, as in to purchase or convey something tantum et tale.
transactio transaction Out-of-court settlement
tutela guardianship Tutorship, i.e. legal guardianship under which the ward is only partially or temporarily incapable. Compare cura. Parties are
  • pupillus - ward
  • tutor - guardian
Unus testis, nullus testis one witness, no witness The uncorroborated testimony of one witness should be discounted because it is deemed to be too unreliable to establish a fact
uno contextu single joining together Contemporaneously; when the phases of something are done without interruption or any intervening action; specifically, executed in one single execution ceremony (vs. ex intervalo temporis)
usucapio seizure of use Acquisitive prescription, i.e. the civilian equivalent of adverse possession. Also called 'prescription acquirendi causa'.
usufructus use-fruit Civilian equivalent of a life estate. Parties:
  • nudus dominus 'bare owner' (= remainderman, reversioner)
  • usufructuarius 'usufructuary' (= life tenant)
via executoria executorial way Non-judicial foreclosure under a power of sale clause in a mortgage; more broadly, any non-judicial remedy empowered under a contractual clause or some other instrument
via iure way of law Using the courts and the justice system (opposite of self-help)
vinculum iuris the chain of the law A legal bond, especially the bond tying obligor and obligee in a legal obligation
vis maior superior force Force majeure arising from an act of God, i.e. events over which humans have no control, and so cannot be held liable. Compare casus fortuitus (see above).
vitium in contrahendo vice in contracting Vitiating factor in the formation of a contract, e.g. mistake (error), misrepresentation (dolus), and duress (metus).
voluntatis declaratio Declaration of will, manifestation of intent(ion)

Ecclesiastical law

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Term or phrase Definition and use
advocatus diaboli Official who argues against an individual's beatification
de iure quaesito non tollendo A principle referred to in papal documents such as Pope Gregory XVI's Benedictus Deus, 1834,[20] and Pope Pius X's Quae rei, 1908.[21]
ebdomadarius Person in a cathedral who supervises regular performance of religious services and assigns duties of choir members
eleemosynae Possessions of the church
embryo formatus Human embryo "organized into human shape and endowed with a soul"[22]
embryo informatus Human embryo before endowment with a soul[23]
episcoporum ecidicus church lawyer
episcopus puerorum "bishop of the boys"; a layperson who on some feastdays braided his hair, dressed as a bishop and acted in a "ludicrous" manner[22]
excommunicato capiendo Writ originally issued from chancery that required a sheriff to arrest and imprison an excommunicant defendant
excommunicato recapiendo Writ ordering excommunicant imprisoned for "obstinancy" be re-imprisoned if freed before agreeing to obey authority of church
Extravagantes Papal constitutions and decretal epistles of Pope John XXII
formata Canonical letters
gardianus ecclesiae Churchwarden
legit vel non "Does he read or not?"; this question was asked to church officials by secular courts when an accused defendant claimed a jurisdictional exemption under benefit of the clergy and if the church accepted the claim the official would reply legit ut clericus ("he reads like a clerk")

See also

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Notes

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References

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Revisions and contributorsEdit on WikipediaRead on Wikipedia
from Grokipedia
A list of Latin legal terms compiles the diverse array of phrases, maxims, and words borrowed from Latin that form a core part of legal vocabulary, especially in jurisdictions influenced by English legal traditions. These terms, known collectively as Law Latin, function not as a full but as specialized expressions adapted for modern , often retaining meanings distinct from their classical origins. The historical roots of Latin in law extend to , where the —enacted around 450–451 BC—established the foundational code of in Latin, serving as a model for subsequent legal developments across . Latin served as the of during the Roman Empire's expansion from the 3rd century BC and persisted after its fall in 476 AD. This tradition continued with the Corpus Iuris Civilis, a comprehensive compilation of Roman legal texts ordered by Emperor in the 6th century AD, which preserved and disseminated Latin legal principles. In medieval , Latin dominated legal scholarship and , influencing thinkers like , and bridging Roman civil law principles with emerging systems. In the context of English , Latin's prominence surged after the of 1066, when it became the standard language for official records, pleadings, and statutes due to its role in and administrative contexts, supplanting Norman French in legal documentation. This practice endured as the language of legal records until the early , with a formal shift to English mandated by an in 1731, though Latin had already waned in spoken proceedings by the late . The persistence of Latin terms arose from their entrenched utility in expressing nuanced concepts, such as procedural rights and evidentiary standards, avoiding the ambiguities of vernacular translations. In contemporary legal practice, particularly in the United States and other countries, Latin terms remain integral to statutes, judicial opinions, contracts, and , offering concise encapsulations of principles like de novo (anew, as in a fresh ) or in camera (in chambers, denoting private proceedings). Their usage has experienced a modest revival in modern court opinions since the late , valued for precision, tradition, and international intelligibility among legal professionals, even as efforts to vernacularize continue. This enduring legacy underscores Latin's role in unifying diverse legal doctrines under shared terminology.

Common Law Terms

Criminal and Penal Concepts

In common law jurisdictions, criminal liability requires both a voluntary physical act or omission, known as actus reus, and a culpable mental state, or mens rea, to establish that the defendant is blameworthy for the offense. The actus reus refers to the "guilty act" that forms the external, observable component of a crime, such as a bodily movement or failure to act when under a legal duty, and it must be voluntary to support conviction. For instance, statutes may impose a duty to act, like a parent's obligation to protect a child, rendering omission criminal if it breaches that duty. This element distinguishes criminal conduct from mere thoughts or involuntary actions, ensuring no liability attaches without a tangible deed. Complementing actus reus is mens rea, the "guilty mind" denoting the defendant's or knowledge at the time of the act, which varies by offense type. traditionally divides mens rea into general intent, where the defendant purposefully performs the actus reus without needing further purpose (e.g., battery requiring only intent to touch), and specific intent, which demands to achieve a particular result or consequence (e.g., requiring to permanently deprive). These categories help calibrate , with specific intent crimes often carrying harsher penalties due to the heightened foresight involved. A foundational procedural safeguard in criminal proceedings is the writ of habeas corpus, which commands authorities to produce a detainee before a to justify the legality of custody. Originating in medieval English around the as a tool to challenge unlawful imprisonment, it evolved through jurisdictional disputes between courts and gained statutory force in 1679 via the Habeas Corpus Act, protecting against arbitrary detention. By the , English courts routinely issued the writ to review executive actions, embedding it as a bulwark of personal liberty in Anglo-American . Prosecutors exercise discretion through nolle prosequi, a formal entry meaning "to be unwilling to prosecute," allowing them to terminate proceedings after but before without prejudice to refiling. Rooted in English , this mechanism permits abandonment of charges due to evidentiary insufficiency, witness unavailability, or policy reasons, originating from but shifting to prosecutorial authority in the 18th and 19th centuries. Unlike dismissal, nolle prosequi does not bar future prosecution for the same offense unless jeopardy has attached. To prevent repeated prosecutions, employs the pleas of autrefois acquit ("previously acquitted") and autrefois convict ("previously convicted"), which bar retrial for the same offense under principles. These pleas, traceable to the in 1066, embody the ancient prohibition against , ensuring finality after or . An autrefois acquit plea succeeds if the prior involved the same facts and , while autrefois convict applies post- to avoid cumulative . These concepts intersect in defenses like necessity, as illustrated in the 1884 English case , where shipwreck survivors killed and cannibalized a to avert starvation but were convicted of . The court rejected necessity as a justification for , a malum in se offense inherently evil regardless of context, distinguishing it from malum prohibitum crimes wrong only because statutorily forbidden. This ruling affirmed that self-preservation cannot override the sanctity of innocent life, limiting necessity to non-homicidal scenarios in .

Civil and Contractual Principles

In systems, civil and contractual principles derived from Latin terms form the backbone of disputes, governing liabilities in contracts, torts, and remedies for breaches or harms. These principles emphasize individual responsibility, fairness in transactions, and equitable adjustments in adversarial proceedings, often evolving through judicial interpretations in English courts. Unlike criminal law's punitive focus, these doctrines prioritize compensation and restitution in interpersonal conflicts, such as sales gone awry or negligent injuries. Their application underscores the common law's adversarial nature, where parties bear the burden of disclosure and . The historical development of these Latin terms traces back to medieval English equity courts, which supplemented the rigid by providing flexible remedies in civil matters. Established in the under the to address injustices from strict writs, equity courts incorporated Roman-inspired to enforce good in contracts and trusts. Over time, principles like utmost emerged in Chancery proceedings for and disputes, influencing modern jurisdictions. This equitable foundation allowed for exceptions to harsh rules, such as shifting from absolute buyer beware to implied protections, reflecting societal demands for fairness in commercial dealings. Caveat emptor, meaning "let the buyer beware," is a foundational principle in contracts under , placing the onus on the purchaser to inspect goods and assume risks absent or . Originating in 17th-century English mercantile , it promoted market by discouraging seller liability for latent defects, as seen in early cases like Chandelor v. Lopus (1603). However, its evolution in the introduced exceptions, particularly implied warranties of merchantability and fitness for purpose under statutes like the in the U.S., which shifted toward seller accountability for foreseeable uses. In , caveat emptor traditionally barred claims for hidden defects, but judicial exceptions now apply for non-disclosed issues in residential sales, balancing buyer protection with contractual freedom. Res ipsa loquitur, translating to "the thing speaks for itself," is an evidentiary doctrine in torts that permits inference of a 's breach of duty from alone. Applicable in when an injury would not ordinarily occur without —such as a surgical sponge left in a patient—it requires three criteria: the event must be of a type that implies fault, the defendant must have exclusive control over the causative instrumentality, and the plaintiff's conduct must not contribute to the harm. First articulated in Byrne v. Boadle (1863), an English barrel-falling case, it eases the plaintiff's burden in proving causation, creating a rebuttable of liability. Courts invoke it judiciously to avoid speculation, as in where expert testimony may supplement but not negate the inference. Quantum meruit, or "as much as he has deserved," provides a restitutionary remedy in quasi-contracts to prevent unjust enrichment when no formal agreement exists. In common law, it allows recovery of the reasonable value of services or benefits conferred, measured by market rates rather than subjective merit, as in cases where one party partially performs under an unenforceable contract. Rooted in the equitable action of assumpsit, it applies to implied-in-law contracts, ensuring the recipient does not retain benefits without compensation, distinct from express contracts' expectation damages. For instance, a builder who substantially completes work despite a void agreement may claim quantum meruit to recoup costs, promoting fairness in incomplete transactions. Ex turpi causa non oritur actio, meaning "from a dishonorable cause an action does not arise," is a defense barring plaintiffs from recovering if their claim stems from their own illegal or immoral conduct. In and disputes, it prevents courts from aiding wrongdoers, as established in Holman v. Johnson (1775), where recovery was denied for sold to evade . The doctrine applies narrowly to serious crimes integral to the claim, not peripheral faults, and has been refined to consider proportionality in modern cases involving . Thus, a participant in an illegal drag race cannot sue for injuries sustained therein, upholding the maxim's role in maintaining judicial integrity. Uberrimae fidei, or "of the utmost ," imposes a heightened of full disclosure on parties in certain contracts, particularly and fiduciary relationships, where exists. Originating in English law via (1766), it requires proactive revelation of all material facts, even if not inquired about, to avoid voiding the agreement for non-disclosure. In , this extends to partnerships and suretyships, where breach—such as concealing health risks in —triggers rescission or forfeiture. Equity courts historically enforced it to mitigate , influencing statutes like the U.S. Act.

Procedural and Evidentiary Rules

In systems, procedural and evidentiary rules govern the mechanics of litigation, ensuring fair through structured processes for reviewing decisions, compelling actions, allocating proof responsibilities, and handling . These rules often incorporate Latin terms derived from historical English practices, emphasizing writs, standards of proof, and adversarial contestation to uphold . Such terms facilitate the oversight of lower courts, enforcement of duties, and presentation of facts in trials, distinguishing from inquisitorial systems by relying on parties to drive the proceedings. , a , directs a to deliver its record to a higher for review, typically to examine jurisdictional errors or excesses of authority rather than merits of the case. Historically used to correct jurisdictional overreach, it allows appellate courts to quash invalid proceedings without a full , as seen in early 20th-century U.S. applications where it addressed improper exercises of power by inferior tribunals. Mandamus, another prerogative writ rooted in common law, compels a public official, lower court, or government body to perform a specific nondiscretionary duty when they have refused or neglected to act. Issued only when no other adequate remedy exists, it enforces legal obligations, such as requiring an agency to process an application, and is codified in federal practice under 28 U.S.C. § 1361 for district courts to direct executive actions. The onus probandi, or burden of proof, assigns the responsibility to a party to establish facts supporting their claim or defense, with failure to produce evidence resulting in an adverse finding. In civil cases, this typically requires proof by a preponderance of the evidence, meaning the trier of fact must find the asserted facts more likely true than not—often described as tipping the scales slightly in favor of the proponent. In contrast, criminal prosecutions demand proof beyond a reasonable doubt, a higher threshold ensuring moral certainty of guilt to protect against wrongful convictions, as the prosecution bears this onus for every element of the offense. Nunc pro tunc, translating to "now for then," authorizes courts to enter orders or judgments retroactively to reflect what should have been done at an earlier date, correcting clerical errors or oversights without altering substantive rights. Commonly applied to validate delayed filings or amend records, it prevents injustice from technical delays, as in cases where courts backdate approvals to preserve parties' positions. Subpoena duces tecum, meaning "bring with you," is a court-issued command requiring a to appear and produce specified documents, records, or tangible relevant to the proceedings. Distinct from a mere subpoena, it enforces discovery in both civil and criminal matters under Federal Rule of Civil Procedure 45, with non-compliance punishable by , ensuring essential materials are available for examination. Central to these rules is the , a foundational principle where parties actively present competing evidence and arguments before a neutral or , who acts as a passive arbiter rather than investigator. This approach, embodied in U.S. federal courts, promotes thorough advocacy and fairness, as illustrated in trials where counsel cross-examine witnesses and object to inadmissible evidence, with the court relying on party presentation to resolve disputes without injecting its own inquiries. For instance, in criminal proceedings, the prosecution and defense structure the evidentiary record, upholding the until proof beyond .

Civil Law Terms

Obligations and Contracts

In civil law traditions, obligations and contracts form a cornerstone of , deriving primarily from principles codified in the and later influencing systems like the [Napoleonic Code](/page/Napoleonic Code). These terms emphasize enforceable duties arising from agreements, delicts, or quasi-contractual situations, prioritizing and equity in performance. Unlike procedural or property-focused concepts, obligations here address personal liabilities and remedies for breaches or unjust gains, ensuring contractual stability while allowing for equitable adjustments. The principle of , meaning "agreements must be kept," serves as a foundational maxim in Roman contract law, mandating the binding force of consensual agreements to promote reliability in commercial and private dealings. Originating in classical Roman jurisprudence and later enshrined in Justinian's Digest, it underscores that valid pacts create enforceable obligations, influencing both civil and international law by rejecting unilateral repudiation without cause. Central to contractual validity and execution is bona fides, or good faith, which requires parties to act honestly and fairly throughout formation, performance, and termination of obligations. In Roman law, bona fides was essential to all contracts, implying the absence of fraud (dolus) or deceit, with breaches allowing remedies like the exceptio doli to defend against enforcement. This duty extends beyond literal terms to prevent opportunistic behavior, as articulated in the Institutes of Gaius and Justinian's Digest. The lex commissoria, a forfeiture in sales contracts, permitted vendors in to reclaim property if buyers failed to pay by the stipulated date, treating the sale as absolute but revocable upon default. Inserted as a pactum in credit sales, it allowed immediate rescission without judicial intervention, though later emperors like Constantine restricted its harshness to protect debtors from disproportionate penalties. This mechanism balanced creditor security with buyer risk in unsecured transactions. Novatio refers to the substitution of a new for an existing one, extinguishing the original through a fresh agreement that transfers or modifies the liability. In classical , as defined by in the Digest, novatio required intent to replace the prior duty, often via a new stipulatio (formal promise), and could involve changing debtors, creditors, or terms while preserving the underlying cause. This tool facilitated without releasing parties entirely. Remedying , solutio indebiti (undue payment) allows recovery of payments made without legal basis, enforced through the condictio indebiti action in . This quasi-contractual remedy, rooted in the principle that no one should be enriched at another's expense without cause, applied to mistaken or erroneous transfers, as seen in Justinian's codification where the recipient bore the burden to prove a valid . It complemented contractual obligations by addressing gaps in formal agreements. Civil law obligations differ from contracts by emphasizing codified over and , with the of 1804 integrating Roman principles like pacta sunt servanda and bona fides into a systematic framework that prioritizes equity in performance. While relies on adversarial case development and doctrines like uberrimae fidei for utmost in specific contexts, civil systems enforce broader duties of loyalty through . The Code's influence extended Roman obligations into modern European and Latin American jurisdictions, standardizing remedies for delicts and quasi-contracts.

Property and Real Rights

In civil law systems, property and real rights encompass in rem entitlements that bind the world at large, as opposed to personal obligations enforceable only against specific parties. These concepts originate primarily from Roman law, codified in Justinian's Institutes (circa 533 CE), which classify property rights into absolute ownership and limited real rights such as servitudes and security interests. This framework influences modern continental codes, like the French Civil Code (1804) and German Bürgerliches Gesetzbuch (BGB, 1900), emphasizing dominium as the core of ownership while distinguishing it from possessory or usufructuary interests. Dominium denotes full quiritarian ownership under Roman ius civile, granting the dominus (legitimate owner) exclusive control over a corporeal thing, including the rights to use (usus), enjoy its fruits (fructus), and dispose of or destroy it (abusus). In Justinian's Institutes (Book II, Title 2), this ownership could be absolute or limited, with later reforms merging quiritarian and in bonis forms to simplify acquisition through tradition or usucapio. Continental codes retain this tripartite structure; for instance, Article 544 of the French Civil Code defines ownership as the right to enjoy and dispose of things in the most absolute manner, subject only to legal limits. Servitudes (servitutes) are limited real rights that burden one property (servient estate) for the benefit of another (dominant estate) or a person, without transferring . Justinian distinguished praedial servitudes (servitutes praediorum), which attach to land and pass with —such as rights of way (iter or actus) or aqueducts (aquaeductus)—from personal servitudes (servitutes personarum), which benefit an individual and expire on death, like (ususfructus) allowing use and fruits without alienation. Praedial servitudes promote utility between estates, as in Dig. 8.2.1, while personal ones, per Justinian's classification, include habitation (habitatio) for dwelling rights; modern codes like BGB §§ 1018–1099 codify these, contrasting with easements that lack the personal variant's emphasis on individual tenure. Emphyteusis establishes a perpetual or long-term lease (ius emphyteuticarium) over another's land, granting the emphyteuta near-ownership rights including cultivation, improvement, and heritability, in exchange for a fixed annual canon (rent). Originating in late Roman law under emperors like Zeno (c. 474–491 CE), it encouraged agricultural development by obligating the holder to enhance the property's value, with forfeiture only for non-payment or neglect; Justinian regulated it in Novels 159 and 164, influencing Italian and French codes where it survives as a building or agricultural lease (e.g., Italian Civil Code Art. 977). Usucapio, or acquisitive prescription, allows ownership acquisition through continuous, good-faith possession of another's property for a statutory period, originally one year for movables and two for immovables under the Twelve Tables (c. 450 BCE). Justinian's Institutes (Book II, Title 4) streamlined this via longi temporis praescriptio (30 years, no good faith required) and usucapio (shorter periods with good faith), extinguishing prior claims to promote stability; continental systems adapt it, as in French Civil Code Art. 2272 (10–30 years) and BGB § 900 (5–30 years), differing from common law adverse possession by integrating good faith and shorter terms for registered titles. Hypotheca functions as a non-possessory , pledging property to secure a while the retains and use, enforceable by judicial sale upon default. Evolving in the mid-Empire from pignus (possessory pledge), it was formalized by Justinian (Institutions, Book III, Title 14), allowing general hypothecae over all assets (per 3.80–81); unlike mortgages requiring conveyance, civil law hypothecae under codes like French Civil Code Arts. 2424–2434 rank by priority and permit multiple encumbrances without dispossession. Civil law property prioritize abstract, codified ownership (dominium ex jure) over 's feudal estates like , which evolved from tenure hierarchies and emphasize conveyance deeds. For example, while distinguishes freehold from leasehold estates with reversionary interests, continental codes (e.g., BGB Book 3) treat all as variants of dominium or limited , facilitating clearer registration as in France's publicité foncière system.

Family and Succession Matters

In civil law systems rooted in Roman traditions, family and succession matters encompass Latin terms that delineate marital validity, parental relationships, transmission, and safeguards for familial assets, ensuring orderly transfer of status and across generations. These concepts emphasize universal succession and protected shares, distinguishing civil law from approaches by prioritizing familial obligations over absolute testamentary freedom. The term matrimonium denotes the lawful marriage union, requiring mutual consent (consensus) and adherence to formalities for validity under Roman civil law, as codified in subsequent continental systems. A matrimonium putativum, or , arises when parties contract in with solemnity, believing it valid, but an impediment renders it null; nonetheless, it confers civil effects, such as legitimizing children born prior to the invalidity's discovery and potentially entitling the innocent spouse to support. This doctrine, derived from praetorian equity, persists in modern civil codes like Louisiana's, where it protects against the harsh consequences of technical nullity. Filius legitimus refers to a legitimate child born within a valid , automatically entitled to full paternal succession rights and family status under , inheriting as a sui heres upon the father's death. In contrast, a filius naturalis is an illegitimate child born to free, unmarried parents in a (), historically barred from civil law inheritance but granted limited succession rights under praetorian law, such as maintenance and half-shares if legitimated by subsequent or imperial rescript. Justinian's reforms in the sixth century equalized their status more closely with legitimate children for succession purposes, influencing civil codes that now often recognize parental acknowledgment to confer parity. Hereditas embodies the principle of universal succession in Roman and civil law, whereby the heir assumes the deceased's entire legal position, including assets, debts, and obligations, as if the persona continued unbroken. During the interim before acceptance, the estate exists as hereditas jacens (lying or pending inheritance), treated as res nullius (ownerless property), vulnerable to claims but not fully alienable. Upon claim via the hereditas petita action—a praetorian remedy to vindicate the heir's right—the successor perfects title, enabling distribution; this framework underpins civil codes emphasizing collective family inheritance over fragmented bequests. The legitima portio, or portion, reserves an indefeasible share of the estate for protected heirs like children and surviving spouses, typically one-half to two-thirds depending on size, to prevent disinheritance and preserve familial support. Rooted in Roman law's querela inofficiosi testamenti (complaint of undutiful will), it limits testamentary disposition of the quot pars bonorum (available portion), as seen in the French Civil Code (Article 913) and equivalents, where descendants claim it collatively. Complementing this, an interdictum served as a praetorian prohibition against unauthorized alienation of , such as undivided estates or minors' holdings, enforceable via possessory remedies to maintain integrity until partition or majority. Post-2020 reforms in civil law jurisdictions have advanced gender equality within these frameworks, addressing historical biases in marriage and succession. China's 2020 Civil Code, for instance, equalized spousal property rights in marriage and eliminated discriminatory inheritance preferences, mandating equal shares for sons and daughters while enhancing women's control over marital assets. Similarly, Rwanda's 1999 inheritance law reform (Law No. 22/1999) granted daughters equal inheritance to ancestral property, abolishing male primogeniture. Morocco's 2024 family law reform proposals retained Sharia-influenced double shares for males in inheritance but allowed gifting of assets to enhance women's shares. These updates, often aligned with UN Sustainable Development Goal 5, reflect a broader trend toward substantive equality in codified family laws.

Ecclesiastical and Canon Law Terms

Church Governance and Administration

In canon law, the governance and administration of the Catholic Church rely on a hierarchical structure rooted in Latin terminology that delineates authority, reporting mechanisms, and organizational bodies. These terms emphasize the unity of the universal Church under the Roman Pontiff while supporting local ecclesiastical administration. Key concepts include periodic visitations by bishops, the central role of the Apostolic See, the operational framework of the Roman Curia, auxiliary roles in dioceses, mechanisms for invalidating administrative decisions, and reforms enhancing consultative bodies like synods. Ad limina refers to the mandatory quinquennial visit by each (or equivalent) to the thresholds (limina) of the Apostles in , specifically the tombs of Saints Peter and Paul, during which the bishop reports on the state of his to the Roman Pontiff and relevant curial dicasteries. This practice fosters communion between local churches and the universal Church, allowing for guidance and unity in pastoral governance. The obligation is codified in Canon 399 of the , requiring the visit every five years unless legitimately impeded, with reports submitted to the . The , also known as the , denotes the juridical authority centered in the Roman Pontiff as the successor of , extending to the institutes of the that assist in supreme governance. It embodies the perpetual jurisdiction over the universal Church, ensuring doctrinal fidelity and administrative oversight. Canon 361 of the Code of defines it to include not only the but also the Secretariat of State, the Council for the Public Affairs of the Church, and other curial bodies. Curia romana, or , comprises the ensemble of dicasteries, offices, and tribunals that aid the Roman Pontiff in exercising pastoral governance over the universal Church, handling matters such as , , and administration through specialized congregations (e.g., for bishops or ) and tribunals like the . Established as a permanent structure, it evolved from medieval papal administration to a formalized body under . The 1988 apostolic constitution Pastor Bonus outlined its composition, including nine congregations, three tribunals, and various secretariats, emphasizing and efficiency. This was further reformed in 2022 by , which reorganized dicasteries to prioritize evangelization, incorporated lay participation, and integrated synodal elements for broader consultation. Vicarius generalis, or , is the principal deputy appointed by the to assist in the governance of the entire , exercising ordinary vicarious power in spiritual and temporal affairs except where reserved to the . This role ensures continuity and support in administrative duties, such as issuing decrees or overseeing . Canon 475 §1 of the Code of Canon Law mandates the appointment of a in each , who serves as the 's closest collaborator and must be a with suitable qualities. Canons 476–481 further specify qualifications, appointment procedures, and cessation of office, underscoring the vicar's role in maintaining diocesan unity. Nullity in the context of administrative acts pertains to the declaration that a decree, rescript, or other ecclesiastical administrative decision is invalid due to defects in form, competence, or substance, rendering it legally void ab initio. Such declarations protect the integrity of church governance by allowing recourse against flawed acts, typically through administrative recourse or judicial processes. The 1983 Code of Canon Law addresses this in Canons 124–128 (general norms for administrative acts) and 1732–1739 (recourse against decrees), where nullity can be established if an act violates law or lacks essential elements, with the competent authority (e.g., higher tribunal or the Apostolic See) issuing the declaration. Post-Vatican II reforms, initiated in the 1960s, significantly reshaped church governance by emphasizing collegiality and synodality, including the establishment of the Synod of Bishops as a permanent consultative body to the Pope on major issues. Convened by Pope Paul VI in 1965 in response to the Council's Christus Dominus, the Synod facilitates episcopal input without legislative power, meeting in ordinary or extraordinary assemblies. Canons 342–348 of the Code of Canon Law formalize its structure, convocation, and role in fostering unity. Subsequent developments, such as the 2018 apostolic constitution Episcopalis communio, integrated synodal outcomes more directly into decision-making, enhancing administrative responsiveness.

Doctrinal and Sacramental Principles

In ecclesiastical and canon law, doctrinal and sacramental principles form the theological foundation of Catholic teaching, articulating core beliefs about divine , the sacraments, and the Church's infallible in matters of . These principles, often expressed through Latin , emphasize the unchanging nature of revealed truths while allowing for clarification over time. They govern how doctrines are promulgated and how sacraments confer grace, ensuring fidelity to . Ex cathedra refers to the solemn exercise of the Pope's teaching , whereby he defines a concerning or morals as binding on the whole Church, invoking his supreme apostolic and intending to do so definitively. This mode of teaching is infallible, meaning it is protected from error by the , as articulated in the First Vatican Council's (1870), which specifies that such definitions are irreformable by their very nature. The term derives from the Latin for "from the chair," symbolizing the of Peter, and has been invoked rarely, such as in the definitions of the (1854) and the (1950). Transubstantiatio, or , denotes the miraculous change by which the whole substance of bread and wine is converted into the substance of the Body and Blood of Christ during the Eucharistic consecration, while the accidents (appearances) remain unchanged. Affirmed dogmatically at the (Session XIII, 1551), this principle underscores the real presence of Christ in the as a substantial, not merely symbolic, reality, distinguishing Catholic teaching from Protestant views. The (1992) elaborates that this conversion occurs through the power of God, effected by the spoken by the priest acting . Matrimonium ratum et consummatum describes a valid sacramental between baptized persons that has been both ratified (ratum, through valid ) and consummated (consummatum, through a conjugal act open to procreation). According to the Code of Canon Law (1983), such a is indissoluble by any human authority, reflecting its elevation to a sacred covenant mirroring Christ's union with the Church. A that is ratum but not consummated (ratum tantum) may be dissolved by the for grave reasons, but once consummated, it attains full sacramental permanence. Indissolubilitas encapsulates the essential property of as an unbreakable bond, particularly in its form, where unity and permanence are endowed with special firmness by grace. Canon 1056 of the Code of Canon Law states that this indissolubility stems from the natural law and divine institution, elevated in Christian to signify Christ's irrevocable fidelity to the Church. The further explains that it demands total mutual self-giving, excluding any intention to dissolve the union, and thus prohibits while allowing for separation in cases of hardship. This principle aligns briefly with civil recognitions of validity but prioritizes its theological dimension. Heresy, defined as the obstinate post-baptismal denial or doubt of a truth to be held by divine and Catholic faith, constitutes a grave doctrinal error that fractures communion with the Church. Canon 751 of the Code of Canon Law identifies it as a formal act of dissent from revealed truth, such as denying the or the , which incurs latae sententiae upon manifestation. The reinforced this by anathematizing heresies against sacraments and doctrines, while modern teachings, like those in the , stress the need for fraternal correction before formal declaration. These principles trace their formal articulation to the (1545-1563), which responded to the Protestant by dogmatically defining the seven sacraments, , and the indissolubility of marriage against reformist challenges, as in Sessions VII, XIII, and XXIV. Subsequent developments, including Vatican I's clarification of (1870) and Vatican II's emphasis on sacraments as encounters with Christ (, 1963), refined their application without altering substance. The (1992) synthesizes these into a comprehensive exposition, integrating patristic, medieval, and conciliar sources for contemporary catechesis.

Disciplinary and Penal Provisions

In , disciplinary and penal provisions address offenses committed by the faithful, particularly , through a system of censures and medicinal penalties aimed at correction, reconciliation, and protection of the community. These provisions, outlined in Book VI of the Code of Canon Law (CIC), distinguish between automatic (latae sententiae) and imposed (ferendae sententiae) penalties, emphasizing pastoral mercy alongside justice. Unlike secular , canon law penalties focus on spiritual consequences and restoration rather than mere retribution, with processes conducted in ecclesiastical tribunals that prioritize truth-seeking and the . Excommunicatio, or , represents the gravest censure in , excluding the offender from participation in the sacraments and acts, thereby severing communion with the Church. It prohibits the excommunicated from celebrating or receiving the and other sacraments, as well as exercising any office or function. Excommunication can be ferendae sententiae, imposed by a competent authority after , or latae sententiae, incurred automatically upon commission of specified grave offenses, such as procuring an or using physical force against the Roman . Reserved cases, like those against the or the , require by the . Suspensio, or suspension, is a penalty primarily affecting clerics, prohibiting the exercise of their sacred orders, ministry, or acquisition of offices and benefits. It serves as a medicinal measure to prevent further harm while allowing for repentance and rehabilitation. The scope of suspension is defined by law or judicial and may include obligations of restitution for any benefits received during its imposition. For instance, a cleric who administers sacraments to those prohibited from receiving them incurs suspension, alongside other penalties if the act is deliberate. In cases of , bishops may impose precautionary suspension during investigations. Irregularitas refers to perpetual impediments that bar individuals from receiving or exercising them, arising from defects, crimes, or penal sanctions. These include irregularities from , , or simulation of acts, which multiply if stemming from distinct causes but not from repetition of the same. An individual bound by irregularity who conceals it to receive orders incurs automatic suspension from the order conferred. Dispensation from irregularities is reserved to the in grave cases, ensuring suitability for ministry. Delictum, denoting an ecclesiastical crime or offense, encompasses violations of that warrant penal sanctions, with Book VI classifying them into general and particular categories. Grave delicts (delicta graviora), such as those against faith or morals, are reserved to the Congregation for the Doctrine of the Faith. Regarding , post-2019 reforms under Vos estis lux mundi expanded reporting obligations and defined offenses including abuse of minors or vulnerable persons by clerics, imposing latae sententiae penalties like for cover-ups. The 2021 revision of Book VI further clarified penalties for grooming or exploitation, emphasizing and victim protection. Absolutio involves the formal lifting of censures or penalties through reconciliation, often via the sacrament of penance or a declarative decree by competent authority. For excommunication, absolution requires repentance and may be granted in the internal forum for latae sententiae cases, but external absolution is needed for public offenses. Reserved absolutions, such as for accomplices in grave sins against chastity, are handled by specific confessors or the Holy See. This process underscores canon law's restorative aim, distinct from civil prosecutions like nolle prosequi. Canon tribunals handle penal cases through a structured process unique to ecclesiastical jurisdiction, beginning with a preliminary investigation upon notice of a delict to ascertain facts and protect parties. Unlike civil courts, these proceedings feature a Promoter of Justice to pursue the public good, a Defender of the Accused for rights protection, and no adversarial jury; decisions emphasize equity and mercy, with appeals possible to higher instances like the Roman Rota. Trials occur in secret to safeguard reputations, and penalties are imposed only after proving moral guilt beyond doubt, prioritizing the Church's salvific mission over punitive severity.

International Law Terms

Treaties and Diplomatic Relations

In public international law, Latin phrases play a crucial role in articulating principles governing treaties and diplomatic interactions between states, emphasizing , equity, and procedural formalities. These terms, rooted in traditions, have been codified and applied in modern frameworks such as the Vienna Convention on the Law of Treaties (1969), which provides a comprehensive regime for treaty formation, interpretation, and termination. The convention's provisions reflect enduring Latin maxims while adapting them to contemporary state practice, with no substantive amendments adopted post-2020, though interpretive developments continue through international jurisprudence. Pacta sunt servanda, meaning "agreements must be kept," embodies the foundational principle that treaties are binding upon states and must be performed in , serving as a cornerstone of international stability. This maxim ensures that states cannot unilaterally disregard treaty obligations without justification, preventing arbitrary withdrawals that could undermine global order. Article 26 of the Vienna Convention explicitly codifies it, stating that every in force is binding and must be performed accordingly, with applications seen in cases like the of Justice's (ICJ) on nuclear weapons, where good faith observance was pivotal to treaties. In diplomatic relations, it extends to informal understandings, reinforcing mutual trust among nations. The doctrine of rebus sic stantibus, or "things thus standing," permits the termination or suspension of a if there occurs a fundamental change of circumstances that was not anticipated at the time of conclusion and radically transforms the obligations. This exception to balances rigidity with adaptability, applicable only under strict conditions to avoid abuse, as outlined in Article 62 of the Vienna Convention, which requires the change to affect an essential basis of consent. For instance, post-World War I territorial treaties invoked this principle in interwar disputes, though modern usage is rare and often contested, as in the ICJ's Gabčíkovo-Nagymaros Project case, where environmental shifts were deemed insufficient for termination. Nuntius apostolicus, referring to an , denotes the highest-ranking permanent diplomatic representative of the to a foreign state, blending ecclesiastical authority with . As a public term, it underscores the unique status of the Vatican in global relations, where nuncios enjoy full under the (1961). This role facilitates treaties on and peace , distinct from secular envoys due to the Holy See's at the . In and dispute settlement, ex aequo et bono authorizes decisions based on what is equitable and good, rather than strict legal rules, allowing flexibility when parties consent to such under Article 38(2) of the ICJ Statute. This approach contrasts with traditional positivist methods, promoting just outcomes in complex interstate conflicts, as evidenced in the 1911 Arbitral Award in the Chamizal Arbitration between the and , where equity guided border delimitation. It remains optional and rarely invoked in modern proceedings, reserved for cases demanding fairness over formalism. Ratificatio, or , signifies the formal act by which a state confirms its consent to be bound by a , typically through head-of-state approval following signature and domestic procedures. Under Article 2(1)(b) of the Vienna Convention, it transforms a signed instrument into a legally binding obligation, essential for multilateral agreements like the on . This step ensures parliamentary or constitutional alignment, with delays or refusals impacting diplomatic relations, as seen in varying ratification timelines for pacts.

Conflict and Humanitarian Law

In , which governs the conduct of armed conflicts, several Latin-derived terms encapsulate key principles distinguishing lawful from unlawful actions during warfare. These terms, rooted in historical just war doctrine and codified in modern treaties, emphasize limitations on the initiation and execution of hostilities to protect human dignity and minimize suffering. Central to this framework are distinctions between the legality of resorting to force and the rules binding parties once conflict erupts. Jus ad bellum, meaning "right to war," refers to the body of regulating the conditions under which states may lawfully resort to armed force. This concept, originating in classical , includes criteria such as just cause (e.g., against aggression), right intention, last resort, proportionality, and reasonable chance of success, as articulated in the UN Charter's on the except in or with Security Council authorization. In contrast, jus in bello, or "law in war," delineates the obligations of belligerents during armed conflict, irrespective of the conflict's origins or the parties' motivations. It mandates adherence to principles like distinction, which requires parties to differentiate between combatants and civilians, directing attacks solely against military objectives to spare non-combatants from harm. This principle, enshrined in the , prohibits indiscriminate attacks and ensures humane treatment even for adversaries. The protection of non-combatants, particularly , forms a cornerstone of jus in bello, safeguarding those not directly participating in hostilities based on their distinct status under , preventing their targeting or as affirmed in customary . , or , denotes treacherous acts that invite the enemy's confidence through feigned protected status, such as simulating a surrender or civilian identity to kill, injure, or capture. Prohibited under Article 37 of Additional Protocol I to the , examples include false flags of truce or misuse of medical emblems, as these undermine the foundational trust essential to humanitarian protections. The of 1949, comprising four treaties, integrate these principles into binding obligations for states parties, mandating protections for wounded, prisoners, and civilians while criminalizing grave breaches like willful killing or torture. Post-2022 conflicts, such as those in and Gaza, have prompted (ICC) advancements, including the 2022 opening of investigations into alleged jus in bello violations like attacks on civilians, leading to arrest warrants in 2024 for leaders implicated in disproportionate strikes and , reinforcing accountability under the .

State Responsibility and Jurisdiction

State responsibility in encompasses the attribution of wrongful acts to states and the mechanisms for holding them accountable, rooted in principles that ensure sovereign equality while allowing for jurisdictional oversight through or universal interests. Central to this framework is the of attribution, which determines when conduct—whether by state organs, entities exercising governmental authority, or even private actors under state instructions—can be imputed to the state as an internationally wrongful act. The (ILC) codified these rules in its 2001 Articles on Responsibility of States for Internationally Wrongful Acts, particularly in Chapter II (Articles 4–11), where attribution occurs if the actor is an organ of the state (Article 4), exercises elements of governmental authority (Article 5), or acts under the state's instructions or control (Article 8). These provisions reflect , enabling responsibility for breaches of obligations without requiring fault beyond the act itself. A key breach triggering responsibility is the actus contrarius, referring to a contrary act that violates a state's international obligations, such as disregarding commitments through subsequent incompatible conduct. This aligns with the ILC Articles' definition of an internationally wrongful act as one not in conformity with an international obligation, regardless of intent (Article 2), and has been applied in contexts like treaty supersession where a later act abrogates prior duties under the of contrarius actus. In practice, such acts invoke state liability, as seen in arbitral decisions emphasizing that even de facto exercises of authority can constitute breaches if they oppose binding . Jurisdictional principles further delineate accountability, balancing state sovereignty with mechanisms for dispute resolution. The maxim par in parem non habet imperium embodies sovereign equality, stipulating that one state holds no imperium (authority or jurisdiction) over another equal sovereign, thereby prohibiting unilateral subjection and underpinning doctrines like state immunity. This principle, derived from the equality of states under Article 2(1) of the UN Charter, limits extraterritorial jurisdiction absent consent, ensuring that responsibility is invoked through multilateral forums rather than coercion. Complementing this is forum prorogatum, a doctrine allowing implied consent to the International Court of Justice (ICJ) jurisdiction when a state participates in proceedings without objecting, as provided in Article 79 of the ICJ Rules of Court. For instance, in cases like the 2003 Congo v. France proceedings, the respondent's engagement without reservation established jurisdiction retroactively, facilitating adjudication of state responsibility claims. Certain obligations transcend bilateral relations, imposing duties erga omnes—owed to the as a whole—thus enabling any state to invoke responsibility for violations, such as or , as affirmed in the ICJ's Barcelona Traction case (1970). These obligations, often linked to jus cogens norms, expand standing in judicial proceedings and underscore collective accountability. Recent ICJ advisory opinions illustrate their application to emerging challenges; in its July 23, 2025, opinion on Obligations of States in Respect of , the Court unanimously held that states bear erga omnes responsibilities to prevent significant harm from , breaching which constitutes an internationally wrongful act under and treaties like the UN Framework Convention on Climate Change. The opinion emphasized attribution of emissions to states and the duty to cooperate in mitigation, marking a pivotal expansion of responsibility mechanisms for transboundary environmental threats.

References

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