/ ˌbɑː ˈmɪtsvə; NAmE ˌbɑːr/ noun
1.
a ceremony and celebration for a Jewish boy who has reached the age of 13, at which he accepts the religious responsibilities of an adult
2.
the boy who is celebrating this occasion
—compare bat mitzvah
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WORD ORIGIN
from Hebrew bar miṣwāh , literally son of the commandment .