From Middle English even-, efen-, from Old English efen- (“equal, fellow-, co-”), from Proto-Germanic *ebna- (“like-, level, equal-”, prefix/combining form), from *ebnaz (“equal, even”); same as Old English efen (“equal, even, level”). More at even. Cognate with Scots evin- (“equal-”), Old Frisian ivin-, evn- (“even-”), Old High German eban- (“even-”).
- (rare, dialectal or no longer productive) Prefix occurring mostly in older terms, bearing the meaning of equal-, co-, fellow-, joint-.
- Prefix used chiefly in parasynthetic derivatives with the sense of even.
- Prefix meaning equally, similarly, same.
- Prefix meaning evenly, straight, direct, according to.