Yiddish

Yiddish, historically Judeo-German or Jewish German, is a West Germanic language historically spoken by Ashkenazi Jews. It originated in 9th-century Central Europe, and provided the nascent Ashkenazi community with a vernacular based on High German fused with many elements taken from Hebrew (notably Mishnaic) and to some extent Aramaic. Most varieties of Yiddish include elements of Slavic languages and the vocabulary contains traces of Romance languages. Yiddish has traditionally been written using the Hebrew alphabet.

Before World War II, there were 11–13 million speakers. 85% of the approximately 6 million Jews who were murdered in the Holocaust were Yiddish speakers, leading to a massive decline in the use of the language. Assimilation following World War II and aliyah (immigration to Israel) further decreased the use of Yiddish among survivors after adapting to Modern Hebrew in Israel. However, the number of Yiddish speakers is increasing in Haredi communities. In 2014, YIVO stated that "most people who speak Yiddish in their daily lives are Hasidim and other Haredim", whose population was estimated at the time to be between 500,000 and 1 million. A 2021 estimate from Rutgers University was that there were 250,000 American speakers, 250,000 Israeli speakers, and 100,000 in the rest of the world (for a total of 600,000).

The earliest surviving references date from the 12th century and call the language לשון־אַשכּנז‎ (loshn-ashknaz; lit. 'language of Ashkenaz') or טײַטש‎ (taytsh), a variant of tiutsch, the contemporary name for Middle High German. Colloquially, the language is sometimes called מאַמע־לשון‎ (mame-loshn; lit. 'mother tongue'), distinguishing it from לשון־קודש‎ (loshn koydesh; lit. 'holy tongue'), meaning 'Hebrew and Aramaic'. The term "Yiddish", short for "Yidish-Taitsh" ('Jewish German'), did not become the most frequently used designation in the literature until the 18th century. In the late 19th and into the 20th century, the language was more commonly called "Jewish", especially in non-Jewish contexts, but "Yiddish" is again the most common designation today.

Modern Yiddish has two major dialect groups: Eastern and Western. Eastern Yiddish is far more common today. It includes Southeastern (Ukrainian–Romanian), Mideastern (Polish–Galician–Eastern Hungarian), and Northeastern (Lithuanian–Belarusian) dialects. Eastern Yiddish differs from Western Yiddish both by its far greater size and the extensive inclusion of words of Slavic origin. Western Yiddish is divided into Southwestern (Swiss–Alsatian–Southern German), Midwestern (Central German), and Northwestern (Netherlandic–Northern German) dialects. Yiddish is used in many Haredi Jewish communities worldwide; it is the first language of the home, school, and in many social settings among many Haredi Jews, and is used in most Hasidic yeshivas.

The term "Yiddish" is also used in the adjectival sense, synonymously with "Ashkenazi Jewish", to designate attributes of Yiddishkeit ('Ashkenazi culture'; for example, Yiddish cooking and music).

By the 10th century, a distinctive Jewish culture had formed in Central Europe. By the high medieval period, their area of settlement, centered on the Rhineland (Mainz) and the Palatinate (notably Worms and Speyer), came to be known as Ashkenaz, a term also used for Scythia, and later of various areas of Eastern Europe and Anatolia. In the medieval Hebrew of Rashi (d. 1105), Ashkenaz becomes a term for Germany, and אשכּנזי Ashkenazi for the Jews settling in this area.^{[need quotation to verify]} Ashkenaz bordered on the area inhabited by another distinctive Jewish cultural group, the Sephardi Jews, who ranged into southern France. Ashkenazi culture later spread into Eastern Europe with large-scale population migrations.

Nothing is known with certainty about the vernacular of the earliest Jews in Germany, but several theories have been put forward. As noted above, the first language of the Ashkenazim may have been Aramaic, the vernacular of the Jews in Roman-era Judea and ancient and early medieval Mesopotamia. The widespread use of Aramaic among the large non-Jewish Syrian trading population of the Roman provinces, including those in Europe, would have reinforced the use of Aramaic among Jews engaged in trade. In Roman times, many of the Jews living in Rome and Southern Italy appear to have been Greek-speakers, and this is reflected in some Ashkenazi personal names (such as Kalonymos and Yiddish Todres). Hebrew, on the other hand, was regarded as a holy language reserved for ritual and spiritual purposes and not for common use.

The established view is that, as with other Jewish languages, Jews speaking distinct languages learned new co-territorial vernaculars, which they then Judaized. In the case of Yiddish, this scenario sees it as emerging when speakers of Zarphatic (Judeo-French) and other Judeo-Romance languages began to acquire varieties of Middle High German, and from these groups the Ashkenazi community took shape. Exactly what German substrate underlies the earliest form of Yiddish is disputed. The Jewish community in the Rhineland would have encountered the Middle High German dialects from which the Rhenish German dialects of the modern period would emerge. Jewish communities of the high medieval period would have been speaking their own versions of these German dialects, mixed with linguistic elements that they themselves brought into the region, including many Hebrew and Aramaic words, but there is also Romance.