The definition of a maven is an expert.(noun)
An example of a maven is someone who knows all about wine.
See maven in Webster's New World College Dictionary
☆ or mavin
Origin: Yiddish < LHeb mēvin
See maven in American Heritage Dictionary 4
Origin: Yiddish meyvn
Origin: , from Hebrew mēbîn
Origin: , active participle of hēbîn, to understand, derived stem of bîn, to discern; see byn in Semitic roots.
Learn more about maven