en- BrE AmE ɪn ən, (¦)en —This prefix is stressed ¦en if the following syllable is unstressed ( ˌ enhar ˈ monic). Otherwise the prefix is unstressed, and the weak-vowel form ɪn is preferred in Received Pronunciation (en ˈ large), although some speakers, in Britain particularly regional ones, use en or ən .
EN-
Meaning of EN- in English
Longman Pronunciation English Dictionary. Английский словарь произношений Longman. 2012