Online Etymology Dictionary

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.
convival (adj.): 1640s, from Latin convivalis, from conviva, from convivere (see convivial). Has been replaced in most uses by convivial.
convive (n.): 1640s, from French convive, from Latin conviva "one who feasts with others," from convivere (see convivial). In mid-19c., also "woman 'who lives in the same house with a number of others.' "
convivial (adj.): 1660s, "pertaining to a feast," from Late Latin convivialis, from Latin convivium "a feast," from convivere "to carouse together," from com- "together" (see com-) + vivere "to live" (see vital). Meaning "sociable" is from 18c. Related: Conviviality.
convocate (v.): mid-16c., from Latin convocatus, past participle of convocare (see convocation).
convocation (n.): late 14c., "assembly of persons," from Old French convocation and directly from Latin convocationem (nominative convocatio), noun of action from past participle stem of convocare "to call together," from com- "together" (see com-) + vocare "to call," from vox "voice" (see voice (n.)). Related: Convocational.
convoke (v.): 1590s, from Middle French convoquer (14c.), from Latin convocare "to call together" (see convocation). Related: Convoked; convoking.
convolute (adj.): "rolled up together," 1794, from Latin convolutus, past participle of convolvere (see convolution). The noun meaning "something convoluted" is from 1846.
convoluted (adj.): 1811, past participle adjective from verb convolute (1690s), from Latin convolutus, past participle of convolvere (see convolution); or perhaps a back-formation from convolution. French has convoluté (18c.), in form a past participle adjective, without the verb.
convolution (n.): 1540s, from Latin convolutus, past participle of convolvere "to roll together," from com- "together" (see com-) + volvere "to roll" (see vulva).
convoy (n.): early 16c., "the act of guiding or escorting for protection," from convoy (v.), late 14c., from Old French convoier, from Vulgar Latin *conviare, literally "go together on the road" (see convey). The meaning "train of ships or wagons carrying munitions or provisions in wartime under protection of escort" is from c.1600.
convulse (v.): 1640s, transitive; 1680s, intransitive; from Latin convulsus, past participle of convellere (transitive only) "to pull away, to pull this way and that, wrench," hence "to weaken, overthrow, destroy" (see convulsion). Related: Convulsed (1630s); convulsing.
convulsion (n.): 1580s, from Latin convulsionem (nominative convulsio), noun of action from past participle stem of convellere "to tear loose," from com- "together" (see com-) + vellere "to pluck, pull violently."
convulsive (adj.): 1610s, from French convulsif, from Medieval Latin *convulsivus, from convulsus, past participle of convellere (see convulse (v.)). Related: Convulsively.
cony (n.): see coney.
coo (v.): 1660s, echoic of doves; the phrase to bill and coo is first recorded 1816. Related: Cooing. The noun is recorded from 1729.
cooch (n.): "vagina," slang, c.2003, short for coochie.
coochie (n.): "vagina," slang, by 1991, perhaps from hoochie-coochie, especially in the blues song "Hoochie Coochie Man" by Willie Dixon (1954), featuring a sexually suggestive phrase that traces at least to the 1893 World's Fair (see hoochy koochy).
cook (n.): Old English coc, from Vulgar Latin cocus "cook," from Latin coquus, from coquere "to cook, prepare food, ripen, digest, turn over in the mind" from PIE root *pekw- "to cook" (cf. Oscan popina "kitchen," Sanskrit pakvah "cooked," Greek peptein, Lithuanian kepti "to bake, roast," Old Church Slavonic pecenu "roasted," Welsh poeth "cooked, baked, hot"). Germanic languages had no one native term for all types of cooking, and borrowed the Latin word (Old Saxon kok, Old High German choh, German Koch, Swedish kock).
There is the proverb, the more cooks the worse potage. [Gascoigne, 1575]
cook (v.): late 14c., from cook (n.); the figurative sense of "to manipulate, falsify, doctor" is from 1630s. Related: Cooked, cooking. To cook with gas is 1930s jive talk.
cookbook (n.): 1809, from cook + book (n.). Earlier was cookery book (1630s).
cooker (n.): type of stove, 1884, from cook (v.) + -er (1).
cookery (n.): late 14c.; see cook (n.) + -ery.
cookie (n.): 1703, American English, from Dutch koekje "little cake," diminutive of koek "cake," from Middle Dutch koke (see cake (n.)). Slang application to persons attested since 1920. Phrase that's the way the cookie crumbles "that's the way things happen" is from 1957.
cookout (n.): also cook-out, 1930, American English, from cook (v.) + out (adv.).
cooky (n.): variant of cookie.
cool (adj.): Old English col "not warm" (but usually not as severe as cold), also, of persons, "unperturbed, undemonstrative," from Proto-Germanic *koluz (cf. Middle Dutch coel, Dutch koel, Old High German kuoli, German kühl "cool," Old Norse kala "be cold"), from PIE root *gel- "cold, to freeze" (see cold (adj.)).

Applied since 1728 to large sums of money to give emphasis to amount. Meaning "calmly audacious" is from 1825. Slang use for "fashionable" is 1933, originally Black English; modern use as a general term of approval is from late 1940s, probably from bop talk and originally in reference to a style of jazz; said to have been popularized in jazz circles by tenor saxophonist Lester Young. Related: Coolly.
cool (n.): c.1400, "coldness, coolness," from cool (adj.). Meaning "one's self-control, composure" (the thing you either keep or lose) is from 1966.
cool (v.): Old English colian, "to lose warmth," also figuratively, "to lose ardor," from the root of cool (adj.). Meaning "to cause to lose warmth" is from late 14c. Related: Cooled; cooling.
coolant (n.): "radiator fluid," 1930, from cool (adj.) + -ant.
cooler (n.): 1570s, "a vessel in which something is set to cool," agent noun from cool (v.). Meaning "insulated box to keep things cool" is from 1958. Slang meaning "jail" is attested from 1884.
coolie (n.): name given by Europeans to hired laborers in India and China, c.1600, from Hindi quli "hired servant," probably from kuli, name of an aboriginal tribe or caste in Gujarat. The name was picked up by the Portuguese, who used it in southern India (where by coincidence kuli in Tamil meant "hire") and in China.
coolness (n.): Old English colnesse; see cool (adj.) + -ness. Figurative sense of "calmness" is from 1650s; that of "absence of warm affection" is from 1670s.
coolth (n.): 1540s, from cool on the model of warmth. It persists, and was used by Pound, Tolkien, Kipling, etc., but it never has shaken its odor of facetiousness and become standard.
coomb (n.): also combe, "deep hollow or valley, especially on flank of a hill," mainly surviving in place names, from Old English cumb, probably a British word, from Celtic base *kumbos (cf. Welsh cwm in same sense). Cambridge Dictionary of English Place-Names says, "This is usually taken to be a Celtic loan ... but there was also OE cumb 'vessel, cup, bowl,'" which was "probably used in a transferred topographical sense reinforced in western districts by cwm."
coon (n.): short for raccoon, 1742, American English. It was the nickname of Whig Party members in U.S. c.1848-60, as the raccoon was the party's symbol, and it also had associations with frontiersmen (who stereotypically wore raccoon-skin caps), which probably ultimately was the source of the Whig Party sense (the party's 1840 campaign was built on a false image of wealthy William Henry Harrison as a rustic frontiersman).

The insulting U.S. meaning "black person" was in use by 1837, said to be ultimately from Portuguese barracoos "building constructed to hold slaves for sale." No doubt boosted by the enormously popular blackface minstrel act "Zip Coon" (George Washington Dixon) which debuted in New York City in 1834. But it is perhaps older (one of the lead characters in the 1767 colonial comic opera "The Disappointment" is a black man named Raccoon). Coon's age is 1843, American English, probably an alteration of British a crow's age.
coop (n.): "small cage for poultry," mid-14c., from Old English cype, cypa "basket, cask," akin to Middle Dutch kupe, Swedish kupa, and all probably from Latin cupa "tub, cask," from PIE *keup- "hollow mound" (see cup (n.)).
coop (v.): 1560s, from coop (n.). Related: Cooped; cooping.
cooper (n.): "craftsman who makes wooden vessels," attested from late 12c. as a surname, either from Old English (unattested) or from a Low German source akin to Middle Dutch cuper, East Frisian kuper, from Low German kupe (German Kufe) "cask," cognate with Medieval Latin cupa (see coop (n.)).
A dry cooper makes casks, etc., to hold dry goods, a wet cooper those to contain liquids, a white cooper pails, tubs, and the like for domestic or dairy use. [OED]
The surname Cowper (pronounced "cooper") preserves a 15c. spelling.
cooperate (v.): also co-operate, c.1600, from Late Latin cooperatus, past participle of cooperari "to work together with" (see cooperation). Related: Cooperated; cooperating.
cooperation (n.): late 15c., from Middle French coopération, or directly from Late Latin cooperationem (nominative cooperatio) "a working together," noun of action from past participle stem of cooperari "to work together," from com- "with" (see com-) + operari "to work" (see operation).
cooperative (adj.): also co-operative, c.1600, from Late Latin cooperat-, past participle stem of cooperari (see cooperation) + -ive. Political economy sense is from 1808, from the pre-Marx communist movement. The noun meaning "a cooperative store" is from 1883; meaning "a cooperative society" is from 1921.
coopt (v.): see co-opt.
cooptation (n.): 1530s, "election to fill a vacancy," from Latin cooptationem (nominative cooptatio) "election," noun of action from past participle stem of cooptare (see co-opt). Related: Cooptative.
coordinate (adj.): 1640s, "of the same order," from Medieval Latin coordinatus, past participle of coordinare "to set in order, arrange" (see coordination). Meaning "involving coordination" is from 1769. Related: Coordinance.
coordinate (n.): 1823, in the mathematical sense, especially with reference to the system invented by Descartes; from coordinate (adj.). Hence, coordinates as a means of determining a location on the earth's surface (especially for aircraft), attested by 1960.
coordinate (v.): 1660s, "to place in the same rank," from Latin coordinare (see coordination). Meaning "to arrange in proper position" (transitive) is from 1847; that of "to work together in order" (intransitive) is from 1863. Related: Coordinated; coordinating.
coordination (n.): also co-ordination, c.1600, "orderly combination," from French coordination (14c.) or directly from Late Latin coordinationem (nominative coordinatio), noun of action from past participle stem of Latin coordinare "to set in order, arrange," from com- "together" (see com-) + ordinatio "arrangement," from ordo "order" (see order (n.)). Meaning "action of setting in order" is from 1640s; that of "harmonious adjustment or action," especially of muscles and bodily movements, is from 1855.
coordinator (n.): also co-ordinator, 1864, agent noun in Latin form from coordinate (v.).