Pronunciation: (bät mits'vu, bäs; Seph. Heb.bät' mēts-vä'; Ashk. Heb.bäs mits'vu),[key](often caps.)Judaism. 1. a solemn ceremony, chiefly among Reform and Conservative Jews, that is held in the synagogue on Friday night or Saturday morning to admit formally as an adult member of the Jewish community a girl 12 to 13 years old.
2. the girl participating in this ceremony.
3. to administer the ceremony of bat mitzvah to. Also,bath mitzvah,bas mitzvah.Cf. bar mitzvah.