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conversant (adj.)[conversant 词源字典]: late 14c., from Old French conversant, present participle of converser (see converse (v.)).[conversant etymology, conversant origin, 英语词源]
conversate (v.): by 1994, apparently a back-formation from conversation or an elaboration of converse. According to some, from U.S. black English.
conversation (n.): mid-14c., "living together, having dealings with others," also "manner of conducting oneself in the world;" from Old French conversation, from Latin conversationem (nominative conversatio) "act of living with," noun of action from past participle stem of conversari "to live with, keep company with," literally "turn about with," from Latin com- "with" (see com-) + vertare, frequentative of vertere (see versus).

Specific sense of "talk" is 1570s. Used as a synonym for "sexual intercourse" from at least 1511, hence criminal conversation, legal term for adultery from late 18c. Related: Conversationalist; conversationist.
conversational (adj.): 1779, from conversation + -al (1).
converse (v.): "to communicate (with)," 1590s; earlier "to move about, live, dwell" (mid-14c.), from Old French converser "to talk" (12c.), from Latin conversari (see conversation). Related: Conversed; conversing.
converse (adj.): "exact opposite," 1560s, from Latin conversus "turn around," past participle of convertere "to turn about" (see convert). Originally mathematical. The noun is attested from 1550s in mathematics. Related: Conversely.
conversion (n.): mid-14c., originally of religion, from French conversion, from Latin conversionem (nominative conversatio), noun of action from past participle stem of convertere (see convert (v.)). General sense of "transformation" is early 15c. Of buildings, from 1921. Conversion disorder "hysteria" (attested from 1946 but said to have been coined by Freud) was in DSM-IV (1994).
convert (v.): c. 1300, from Old French convertir, from Vulgar Latin *convertire, from Latin convertere "turn around, transform," from com- "together" (see com-) + vertere "to turn" (see versus). Originally in the religious sense. The Latin word is glossed in Old English by gecyrren, from cierran "to turn, return." Related: Converted; converting.
convert (n.): 1560s, from convert (v.). Earlier was convers (early 14c.).
converter (n.): 1530s, agent noun from convert (v.). Of machinery, from 1867.
convertible (adj.): late 14c., from Old French convertible (13c.), from Late Latin convertibilis "changeable," from Latin convertere (see convert (v.)). The noun is recorded from 1610s; meaning "automobile with a fold-down top" is from 1916.
convex (adj.): 1570s, from Middle French convexe, from Latin convexus "vaulted, arched," past participle of convehere "to bring together," from com- "together," or "thoroughly" (see com-) + vehere "to bring" (see vehicle). Possibly from the idea of vaults carried together to meet at the point of a roof. Related: Convexity. Convex lens is from 1822.
convey (v.): c. 1300, "to go along with;" late 14c., "to carry, transport;" from Anglo-French conveier, from Old French convoier "to escort" (Modern French convoyer), from Vulgar Latin *conviare "to accompany on the way," from Latin com- "together" (see com-) + via "way, road" (see via). It was a euphemism for "steal" 15c.-17c., which helped broaden its meaning. Related: Conveyed; conveying.
conveyance (n.): mid-15c., "act of conveying," from convey + -ance. Meaning "document by which something is legally conveyed" is from 1570s; sense "means of transportation" is attested from 1590s. Related: Conveyanced; conveyancing.
conveyer (n.): 1510s, agent noun from convey. Latinate form conveyor is later (1640s).
convict (v.): mid-14c., from Latin convictus, past participle of convincere "to 'overcome' in argument" (see convince). Replaced Old English verb oferstælan. Related: Convicted; convicting.
convict (n.): late 15c., from convict (v). Slang shortening con is from 1893.
conviction (n.): mid-15c., "the proving of guilt," from Late Latin convictionem (nominative convictio) "proof, refutation," noun of action from past participle stem of convincere (see convince). Meaning "mental state of being convinced" is from 1690s; that of "firm belief, a belief held as proven" is from 1841.
convictions (n.): "those ideas which one believes to be true," 1883, plural of conviction.
convince (v.): 1520s, "to overcome in argument," from Latin convincere "to overcome decisively," from com-, intensive prefix (see com-), + vincere "to conquer" (see victor). Meaning "to firmly persuade" is from c. 1600. Related: Convinced; convincing; convincingly.