en-
/ɪn/ /ɛn/(also em-)
prefix
1(Added to nouns) forming verbs meaning ‘put into or on’: engulf embed
2(Added to nouns and adjectives) forming verbs expressing conversion into the specified state as in encrust, ennoble, or (in combination with the suffix -en) embolden, enliven: embolden encrust
3(Added to verbs) in; into; on: ensnare
3.1As an intensifier: entangle
Origin
From French, from Latin in-. See also in-2, a commonly found by-form.