Etymology
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even (adj.)

Old English efen "level," also "equal, like; calm, harmonious; equally; quite, fully; namely," from Proto-Germanic *ebna- (source also of Old Saxon eban, Old Frisian even "level, plain, smooth," Dutch even, Old High German eban, German eben, Old Norse jafn, Danish jævn, Gothic ibns). The adverb is Old English efne "exactly, just, likewise." Modern adverbial sense (introducing an extreme case of something more generally implied) seems to have arisen 16c. from use of the word to emphasize identity ("Who, me?" "Even you").

Etymologists are uncertain whether the original sense was "level" or "alike." Used extensively in Old English compounds, with a sense of "fellow, co-" (as in efeneald "of the same age;" Middle English even-sucker "foster-brother"). Of numbers, from 1550s. Sense of "on an equal footing" is from 1630s. Rhyming reduplication phrase even steven is attested from 1866; even break (n.) first recorded 1907. Even-tempered from 1712. To get even with "retaliate upon" is attested by 1833.

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even (v.)
Old English efnan "to make even, to make level; liken, compare" (see even (adj.)). Intransitive sense of "become even" is attested from early 13c. Related: Evened; evening.
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even (n.)
"end of the day," Old English æfen, Mercian efen, Northumbrian efern (see eve (n.)).
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break-even (adj.)
also breakeven; usually with point, 1938, from the verbal phrase (1910); see break (v.) + even (adv.). The verbal phrase in the financial sense is recorded from 1914.
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even-handed (adj.)
also evenhanded, "impartial, equitable, rightly balanced," c. 1600, from even (adj.) + -handed. Related: even-handedly; even-handedness.
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eventide (n.)
"evening" (archaic), Old English æfentid; see even (n.) + tide (n.).
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evensong (n.)
the native word for vespers, Old English æfensang; see even (n.) + song.
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evenness (n.)
Old English efenniss "equality, equity;" see even (adj.) + -ness. Meaning "levelness, smoothness" is late 14c.
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e'en 

variant spelling of even (adj.), now archaic or poetic. E'enamost "even almost" is recorded from 1735 in Kentish speech.

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evenly (adv.)
Old English efenlice "evenly, equally;" see even (adj.) + -ly (2). Meaning "so as to produce uniformity of texture is early 15c.; that of "without surface irregularities, smoothly" is from 1630s.
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