In Conservative and Reform Judaism, a Jewish girl of 12 or 13 years of age, considered an adult and responsible for her moral and religious duties.
The ceremony that initiates and recognizes a girl as a bat mitzvah.
tr.v.
bat mitz·vahed or bat miz·vahed or bas mitz·vahed or bas miz·vahed, bat mitz·vah·ing or bat miz·vah·ing or bas mitz·vah·ing or bas miz·vah·ing, bat mitz·vahs or bat miz·vahs or bas mitz·vahs or bas miz·vahs To confirm in the ceremony of bat mitzvah.
[Hebrew bat miṣwâ : bat, daughter; see bn in Semitic roots + miṣwâ, commandment; see mitzvah.]