en-

en- (also em-) ► PREFIX forming verbs: 1) (added to nouns) meaning ‘put into or on’: engulf. 2) (added to nouns and adjectives) meaning ‘bring into the condition of’: enliven. 3) (added to verbs) meaning ‘in, into, or on’ or as an intensifier: ensnare | entangle.

ORIGIN French, from Latin in-.