Etymology
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Words related to even

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 Now superseded in its original sense by evening.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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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.
evensong (n.)
the native word for vespers, Old English æfensang; see even (n.) + song.
eventide (n.)
"evening" (archaic), Old English æfentid; see even (n.) + tide (n.).
good den 
salutation, Elizabethan corruption of good e'en, itself a contraction of good even "good evening," which is attested from c. 1500, first as gud devon, showing a tendency toward misdivision. See good (adj.) + even (n.).
Halloween (n.)

also Hallow-e'en, Hallow e'en, 1781, in a Scottish context, the word and the magical lore about the date were popularized by Burns' poem (1785, and he attached a footnote explaining it), but it probably dates to 17c. in Scotland and is attested as the name of a tune in 1724. The tune is mentioned again in an English-Scots songbook ("The Chearful Companion") in 1783, and Burns was not the first to describe the customs in print.

Hallow-E'en, or Holy Eve, is the evening previous to the celebration of All Saints. That it is propitious to the rites of divination, is an opinion still common in many parts of Scotland. [John Main, footnote to his poem "Hallow-E'en," Glasgow, 1783]

It is a Scottish shortening of Allhallow-even "Eve of All Saints, last night of October" (1550s), the last night of the year in the old Celtic calendar, where it was Old Year's Night, a night for witches. A pagan holiday given a cursory baptism. Otherwise obsolete hallow (n.) "holy person, saint," is from the source of hallow (v.). Also see even (n.), and compare hallows. Hallow-day for "All-Saints Day" is from 1590s; earlier was halwemesse day (late 13c.).

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."

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.
e'en 

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

even-handed (adj.)
also evenhanded, "impartial, equitable, rightly balanced," c. 1600, from even (adj.) + -handed. Related: even-handedly; even-handedness.