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maven (or) mavin (s) (noun); mavens (or) mavins (pl)
1. Someone who knows a great deal about a subject or who is an expert in some area of specialized knowledge: Alex is considered a maven or a connoisseur in the field of cooking.
2. Etymology: from Yiddish meyvn, from Hebrew mebîn, active participle of hebîn, "to understand" and is derived the stem of bîn, "to discern".
This entry is located in the following unit: English Words in Action, Group M (page 3)