Ampliative (from Latin ampliare, "to enlarge"), a term used mainly in logic, meaning "extending" or "adding to that which is already known".

This terminology was often used by medieval logicians in the analyses of the temporal content of their subject terms. There were three rules outlined in its usage:

There are Roman texts that refer to it as ampliatio.

In Norman law, an ampliation was a postponement of a sentence in order to obtain further evidence.