Etymology
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evening (n.)
from Old English æfnung "the coming of evening, sunset, time around sunset," verbal noun from æfnian "become evening, grow toward evening," from æfen "evening" (see eve). As a synonym of even (n.) in the sense "time from sunset to bedtime," it dates from mid-15c. and now entirely replaces the older word in this sense. Another Old English noun for "evening" was cwildtid.
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uneven (adj.)
Old English unefen "unequal, unlike, anomalous, irregular," from un- (1) "not" + even (adj.). Similar formation in Old Frisian oniovn, Middle Dutch oneven, Old High German uneban, German uneben, Old Norse ujafn. Meaning "broken, rugged" (in reference to terrain, etc.) is recorded from late 13c. Related: Unevenly; unevenness.
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anent (prep.)

"concerning, about, in respect or reference to," c. 1200, onont "on level with, beside," also "in the company of, fronting against," a contraction of Old English on efn "near to, close by," literally "on even (ground with);" see a- (1) + even (adj.).

As an adverb, c. 1400, anents, anentes, with adverbial genitive. The unetymological -t was added 12c. Compare German neben "near to, by the side of," short for in eben, from Old High German ebani "equality."

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eve (n.)
c. 1200, eve "evening," especially the time between sunset and darkness, from Old English æfen, with loss of terminal -n (which, though forming part of the stem, perhaps was mistaken for an inflection), from Proto-Germanic *æbando- (source also of Old Saxon aband, Old Frisian ewnd, Dutch avond, Old High German aband, German Abend, Old Norse aptann, Danish aften), which is of uncertain origin. Now superseded in its original sense by evening.

Specific meaning "day before a saint's day or festival" is from late 13c. Transferred sense of "the moment right before any event, etc." is by 1780. Even (n.), evening keep the original form.
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still (adv.)
"even now, even then, yet" (as in still standing there), 1530s, from still (adj.) in the sense "without change or cessation, continual" (c. 1300); the sense of "even, yet" (as in still more) is from 1730.
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flush (v.2)
"make even or level," 1842, from flush (adj.).
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bob (v.2)
"to cut short and even all around," 1822, from bob (n.2). Related: Bobbed.
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plane (adj.)

"having the characteristics of a plane," 1560s, from French plan, from Latin planus "flat, level, even" (see plane (n.1)).

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equate (v.)
early 15c., "to make similar or the same; to balance or harmonize; distribute (ingredients) uniformly; reduce to evenness or smoothness; to set (a fracture)," from Latin aequatus "level, levelled, even, side-by-side," past participle of aequare "make even or uniform, make equal," from aequus "level, even, equal" (see equal (adj.)). Earliest use in English was of astrological calculation, then "to make equal;" meaning "to regard as equal" is early 19c. Related: Equated; equating.
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equanimity (n.)
c. 1600, "fairness, impartiality," from French équanimité, from Latin aequanimitatem (nominative aequanimitas) "evenness of mind, calmness; good-will, kindness," from aequanimis "mild, kind," literally "even-minded," from aequus "even, level" (see equal (adj.)) + animus "mind, spirit" (see animus). Meaning "evenness of temper" in English is from 1610s.
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