Etymology
Advertisement
aware (adj.)

late Old English gewær "watchful, vigilant," from Proto-Germanic *ga-waraz (source also of Old Saxon giwar, Middle Dutch gheware, Old High German giwar, German gewahr), from *ga-, intensive prefix, + *waraz "wary, cautious," from PIE root *wer- (3) "perceive, watch out for."

Related entries & more 
Advertisement
awareness (n.)
"state of being aware," 1828, from aware + -ness. Earlier was awaredom (1752).
Related entries & more 
unawares (adv.)
1530s, "without being aware," from un- (1) "not" + aware + adverbial genitive -s. Meaning "without being noticed" is recorded from 1660s. Form unaware is recorded from 1590s.
Related entries & more 
y- 
perfective prefix, in yclept, etc.; a deliberate archaism, introduced by Spenser and his imitators, representing an authentic Middle English prefix y-, earlier i-, from Old English ge-, originally meaning "with, together" but later a completive or perfective element, from Proto-Germanic *ga- "together, with" (also a collective and intensive prefix), from PIE *kom "beside, near, by, with" (cognate with Sanskrit ja-, Latin com-, cum-; see com-). It is still living in German and Dutch ge-, and survives, disguised, in some English words (such as alike, aware, handiwork).

Among hundreds of Middle English words it formed are yfallen, yhacked ("completely hacked," probably now again useful), yknow, ymarried, ywrought.
Related entries & more 
Advertisement
*wer- (3)

Proto-Indo-European root meaning "perceive, watch out for."

It forms all or part of: Arcturus; avant-garde; award; aware; beware; Edward; ephor; garderobe; guard; hardware; irreverence; lord; panorama; pylorus; rearward; regard; revere; reverence; reverend; reward; software; steward; vanguard; ward; warden; warder; wardrobe; ware (n.) "manufactured goods, goods for sale;" ware (v.) "to take heed of, beware;" warehouse; wary.

It is the hypothetical source of/evidence for its existence is provided by: Latin vereri "to observe with awe, revere, respect, fear;" Greek ouros "a guard, watchman," horan "to see;" Hittite werite- "to see;" Old English weard "a guarding, protection; watchman, sentry, keeper."

Related entries & more 
bo tree (n.)
1680s, from Sinhalese bo, from Pali bodhi, short for bodhi-taru "bo tree," literally "tree of wisdom or enlightenment" (related to Sanskrit buddhah "awakened," from PIE root *bheudh- "be aware, make aware") + taru "tree."
Related entries & more 
conscious (adj.)
Origin and meaning of conscious

c. 1600, "knowing, privy to" (poetic), from Latin conscius "knowing, aware," from conscire "be (mutually) aware," from assimilated form of com "with," or "thoroughly" (see con-) + scire "to know" (see science). The Latin word probably is a loan-translation of Greek syneidos.

The sense of "knowing or perceiving within oneself, sensible inwardly, aware" is from 1630s, perhaps a shortening of conscious to oneself (1620s). Also compare the Latin sense evolution in conscience. From 1650s as "aware (of a fact)." Sense of "active and awake, endowed with active mental faculties" is from 1837. Related: Consciously.

Related entries & more 
consciousness (n.)

1630s, "internal knowledge," from conscious + -ness. Meaning "state of being aware of what passes in one's own mind" is from 1670s; meaning "state of being aware" of anything is from 1746. Consciousness-raising is attested from 1968.

Related entries & more 
witting (adj.)
"aware," mid-14c. (implied in wytindeliche (adv.)), present-participle adjective from wit (v.). Related: Wittingly.
Related entries & more