Meaning of EN- in English

[en-] also em- prefix [ME, fr. OF, fr. L in-, im-, fr. in] 1: put into or onto "enthrone": cover with "enshroud": go into or onto "enplane"--in verbs formed from nouns

2: cause to be "enslave"--in verbs formed from adjectives or nouns

3: provide with "empower"--in verbs formed from nouns

4: so as to cover "enwrap": thoroughly "entangle"--in verbs formed from verbs--in all senses usu. em- before b, m, or p

[2]en- also em- prefix [ME, fr. L, fr. Gk, fr. en in--more at in]: in: within "enzootic"--usu. em- before b, m, or p "empathy" [3]en- comb form [ISV, fr. -ene]: chemically unsaturated; esp: having one double bond "enamine"

Merriam-Webster English vocab.      Английский словарь Merriam Webster.