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habit [habit 词源字典]: habit: [13] Etymologically, a habit is ‘what one has’. The word comes via Old French abit from Latin habitus, originally the past participle of the verb habēre ‘have’. This was used reflexively for ‘be’, and so the past participle came to be used as a noun for ‘how one is’ – one’s ‘state’ or ‘condition’. Subsequently this developed along the lines of both ‘outward condition or appearance’, hence ‘clothing’, and ‘inner condition, quality, nature, character’, later ‘usual way of behaving’.

This proliferation of meaning took place in Latin, and was taken over lock, stock, and barrel by English, although the ‘clothing’ sense now survives only in relation to monks, nuns, and horseriders. (Incidentally, the notion of adapting the verb have to express ‘how one is, how one comports oneself’ recurs in behave.) Derived from Latin habitus was the verb habitāre, originally literally ‘have something frequently or habitually’, hence ‘live in a place’.

This has given English habitation [14], inhabit [14], and also habitat [18], literally ‘it dwells’, the third person present singular of habitāre, which was used in medieval and Renaissance books on natural history to describe the sort of place in which a particular species lived. Malady [13] comes via Old French from an unrecorded Vulgar Latin *male habitus ‘in bad condition’.
=> habitat, inhabit, malady[habit etymology, habit origin, 英语词源]
adapt (v.): early 15c. (implied in adapted) "to fit (something, for some purpose)," from Middle French adapter (14c.), from Latin adaptare "adjust," from ad- "to" (see ad-) + aptare "join," from aptus "fitted" (see apt). Meaning "to undergo modification so as to fit new circumstances" (intransitive) is from 1956. Related: Adapting.
adaptation (n.): c. 1600, "action of adapting," from French adaptation, from Late Latin adaptationem (nominative adaptatio), noun of action from past participle stem of adaptare (see adapt). Meaning "condition of being adapted" is from 1670s. Sense of "modification of a thing to suit new conditions" is from 1790. Biological sense first recorded 1859 in Darwin's writings.
aikido (n.): Japanese art of self-defense, 1936, literally "way of adapting the spirit," from Japanese ai "together" (from au "to harmonize") + ki "spirit" + do "way, art," from Chinese tao "way."
artful (adj.): 1610s, "learned, well-versed in the (liberal) arts," also "characterized by technical skill," from art (n.) + -ful. Meaning "skilled in adapting means to ends" is from 1739. Related: Artfully; artfulness.
dinosaur (n.): 1841, coined in Modern Latin by Sir Richard Owen, from comb. form of Greek deinos "terrible" (see dire) + sauros "lizard" (see -saurus). Figurative sense of "person or institution not adapting to change" is from 1952.
supple (adj.): c. 1300, "soft, tender," from Old French souple, sople "pliant, flexible; humble, submissive" (12c.), from Gallo-Roman *supples, from Latin supplex "submissive, humbly begging, beseeching, kneeling in entreaty," literally "bending, kneeling down," perhaps an altered form of *supplacos "humbly pleading, appeasing," from sub "under" + placare "appease" (see placate). Meaning "pliant" is from late 14c.; figurative sense of "artfully obsequious, capable of adapting oneself to the wishes and opinions of others" is from c. 1600. Supple-chapped (c. 1600) was used of a flatterer. Related: Suppleness.