1(Added to nouns) forming verbs meaning ‘put into or on’:engulfembed
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:emboldenencrust
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.