In Jewish tradition, the word “bar” in “bar mitzvah,” meaning “son,” comes from Aramaic.
The phrase bar mitzvah combines the Aramaic word bar, “son,” with mitzvah, a Hebrew term commonly translated as “commandment.” The expression therefore describes a male who has become responsible for religious commandments, as well as the ceremony or celebration marking that transition.
Aramaic was widely used in Jewish learning and religious literature during late antiquity. It appears prominently in the Talmud and in other Jewish texts, which helps explain why an Aramaic element survives in a phrase used across many Jewish communities.
The feminine form, bat mitzvah, uses bat, the Hebrew and Aramaic-related word for “daughter,” rather than bar. Modern English often treats the entire phrase as a fixed expression, obscuring its mixed linguistic history.