"Happiness." Refers to any happy occasion.
Bar and Bat Mitzvah
"Lifter." Refers to the person who lifts the Torah following the communal reading. The magbia lifts and turns his/her back to the congregation so that all may physically see at least three columns of the scroll.
"Word(s) of Torah." (pl. divrei Torah) Refers to the address to the congregation delivered by the Bar/Bat Mitzvah after the Torah reading. The Hebrew root daled-vet-resh refers in the Hebrew Bible to God's words. Hence, this is an address that should be cognizant of and reflective of holy themes and ideas.
Ceremony marking a girl's reaching the age of religious maturity; plural: b'nei mitzvah.
Ceremony marking a boy's reaching the age of religious maturity; plural: b'nei mitzvah.