en-1Pronunciation: /ɪn, ɛn/ (also em-)Definition of en- prefix 1(added to nouns) forming verbs meaning ‘put into or on’:engulf embed 2(added to nouns and adjectives) forming verbs (often with the suffix -en) meaning ‘bring into the condition of’:embolden encrust 3(added to verbs) in; into; on:ensnare as an intensifier:entangleOrigin:from French, from Latin in-. See also in-2, a commonly found by-formen- in other Oxford dictionaries Definition of en- in the US English dictionary