Longman Dictionary of Contemporary English
The Collaborative International Dictionary
E- \E-\ A Latin prefix meaning out, out of, from; also, without. See Ex-.
Douglas Harper's Etymology Dictionary
the later Romans evidently found words beginning in sc-, sp-, st- difficult or unpleasant to pronounce; in Late Latin forms begin to emerge in i- (such as ispatium, ispiritu), and from 5c. this shifted to e-. The development was carried into the Romanic languages, especially Old French, and the French words were modified further after 15c. by natural loss of -s- (the suppression being marked by an acute accent on the e-), while in other cases the word was formally corrected back to the Latin spelling (for example spécial). Hence French état for Old French estat for Latin status, etc. It also affected Romanic borrowings from Germanic (such as espy, eschew).
Wiktionary
Etymology 1 alt. out, out of pre. out, out of Etymology 2
pre. in an electronic form, usually in association with the internet Etymology 3
pre. for emergency purposes
Usage examples of "e-".
For dessert, she made a tarte tatin, one of the most divine dishes e-er created: caramelized butter and sugar covered with a dozen apples sliced paper thin, cooked on top of the stove, then a round 323 Jude Deveraux of flaky pastry put on top, baked until golden brown, and at last the whole thing was turned upside down onto a plate.