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arousal (n.)[arousal 词源字典]: 1827, "action of arousing, a being awakened" from arouse + -al (2). Sexual association is from c. 1900.[arousal etymology, arousal origin, 英语词源]
awake (v.): a merger of two Middle English verbs: 1. awaken, from Old English awæcnan (earlier onwæcnan; strong, past tense awoc, past participle awacen) "to awake, arise, originate," from a "on" + wacan "to arise, become awake" (see wake (v.)); and 2. awakien, from Old English awacian (weak, past participle awacode) "to awaken, revive; arise; originate, spring from," from a "on" (see a (2)) + wacian "to be awake, remain awake, watch" (see watch (v.)).

Both originally were intransitive only; the transitive sense being expressed by Middle English awecchen (from Old English aweccan) until later Middle English. In Modern English, the tendency has been to restrict the strong past tense and past participle (awoke, awoken) to the original intransitive sense and the weak inflection (awakened) to the transitive, but this never has been complete (see wake (v.); also compare awaken).
awaken (v.): Old English awæcnan (intransitive), "to spring into being, arise, originate," also, less often, "to wake up;" earlier onwæcnan, from a- (1) "on" + wæcnan (see waken). Transitive meaning "to rouse from sleep" is recorded from 1510s; figurative sense of "to stir up, rouse to activity" is from c. 1600.

Originally strong declension (past tense awoc, past participle awacen), already in Old English it was confused with awake (v.) and a weak past tense awæcnede (modern awakened) emerged and has since become the accepted form, with awoke and awoken transferred to awake. Subtle shades of distinction determine the use of awake or awaken in modern English. Related: Awakening.
awoke: past tense of awake (v.), from Old English awoc; also see awaken. The tendency has been to restrict the strong past tense (awoke) to the original intransitive sense of awake and the weak inflection (awakened) to the transitive, but this never has been complete.
awoken: past participle of awake (v.); also see awaken. The tendency has been to restrict the strong past participle (awoken) to the original intransitive sense of awake and the weak inflection (awakened) to the transitive, but this never has been complete.
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;" see bid) + taru "tree."
bode (v.): Old English bodian "proclaim, announce; foretell," from boda "messenger," probably from Proto-Germanic *budon- (cognates: Old Saxon gibod, German gebot, Old Norse boð), from PIE *bheudh- "be aware, make aware" (cognates: Sanskrit bodhati "is awake, is watchful, observes," buddhah "awakened, enlightened;" Old Church Slavonic bljudo "to observe;" Lithuanian budeti "to be awake;" Old Irish buide "contentment, thanks"). As a shortened form of forebode (usually evil), it dates from 1740. Related: Boded; boding.
Buddha (n.): 1680s, from Pali, literally "awakened, enlightened," past participle of budh "to awake, know, perceive," related to Sanskrit bodhati "is awake, observes, understands" (see bode). Title given by his adherents to the man who taught this path, Siddhartha Gautama, also known to them as Sakyamuni "Sage of the Sakyas" (his family clan), who lived in northern India 5c. B.C.E.
re-awaken (v.): also reawaken, 1810, from re- + awaken. Related: Reawakened; reawakening.