Online Etymology Dictionary

combat (n.): 1560s, from Middle French combat (16c.), from combattre (see combat (v.)).
combatant: mid-15c. (adj.), late 15c. (n.), from Old French combatant (Modern French combattant) "skilled at fighting, warlike" (also used as a noun in Old French), present participle adjective of combattre (see combat (v.)).
combative (adj.): 1819, from combat + -ive. In 1820s-30s, much associated with phrenology. Related: Combatively; combativeness (1815).
comber (n.): c.1200, "one who cards wool," agent noun from comb (v.).
combination (n.): late 14c., combinacyoun, from Old French combination (14c., Modern French combinaison), from Late Latin combinationem (nominative combinatio) "a joining two by two," noun of action from past participle stem of combinare (see combine (v.)).
combine (n.): "machine that cuts, threshes and cleans grain" (short for combine harvester), 1857, from combine (v.).
combine (v.): early 15c., from Middle French combiner (14c.), from Late Latin combinare "to unite, yoke together," from Latin com- "together" (see com-) + bini "two by two," adverb from bi- "twice" (see binary). Related: Combinative; combined; combining.
combo (n.): 1929, U.S. slang, originally in entertainment (jazz groups, dance teams), short for combination.
combust: late 14c. as an adjective, "burnt," from Old French combust (14c.), from Latin combustus, past participle of combuere "to burn up, consume" (see combustion). Also an astrological term for planets when near the sun. The verb is attested from late 15c. Related: Combusted; combusting.
combustible (adj.): 1520s, from Middle French combustible, or directly from Late Latin combustibilis, from Latin combustus, past participle of combuere "to burn up, consume" (see combustion). Figurative sense is from 1640s; as a noun, from 1680s. Related: Combustibility (late 15c.).
combustion (n.): early 15c., from Old French combustion (13c.), from Latin combustionem (nominative combustio) "a burning," noun of action from past participle stem of Latin comburere "to burn up, consume," from com-, intensive prefix (see com-), + *burere, faulty separation of amburere "to burn around," actually ambi-urere, from urere "to burn, singe," from PIE root *eus- "to burn" (see ember).
come (v.): Old English cuman "come, approach, land; come to oneself, recover; arrive; assemble" (class IV strong verb; past tense cuom, com, past participle cumen), from Proto-Germanic *kwem- (cf. Old Saxon cuman, Old Frisian kuma, Middle Dutch comen, Dutch komen, Old High German queman, German kommen, Old Norse koma, Gothic qiman), from PIE root *gwa-, *gwem- "to go, come" (cf. Sanskrit gamati "he goes," Avestan jamaiti "goes," Tocharian kakmu "come," Lithuanian gemu "to be born," Greek bainein "to go, walk, step," Latin venire "to come").

The substitution of Middle English -o- for Old English -u- before -m-, -n-, or -r- was a scribal habit before minims to avoid misreading the letters in the old style handwriting, which jammed letters. The practice similarly transformed some, monk, tongue, worm. Modern past tense form came is Middle English, probably from Old Norse kvam, replacing Old English cuom.

Remarkably productive with prepositions (NTC's "Dictionary of Phrasal Verbs" lists 198 combinations); consider the varied senses in come to "regain consciousness," come over "possess" (as an emotion), come at "attack," come on (interj.) "be serious," and come off "occur." For sexual senses, see cum.
comeback (n.): "verbal retort," 1889, from come + back (adj.). Meaning "recovery, return to former position or condition after retirement or loss" is attested from 1908, American English.
comedian (n.): 1580s, "comic poet," later (c.1600) "stage actor in comedies," also, generally, "actor," from Middle French comédien, from comédie (see comedy). Meaning "professional joke-teller, etc." is from 1898.
comedic (adj.): 1630s, from Latin comoedicus, from Greek komoidikos "pertaining to comedy," from komoidia (see comedy).
comedienne (n.): 1860, from French comédienne, fem. of comédien (see comedian).
comedo (n.): "blackhead," etc., 1866, from Latin comedo "glutton," from comedere "to eat up" (see comestible). A name formerly given to worms that devour the body; transferred in medical use to secretions that resemble them.
comedy (n.): late 14c., from Old French comedie (14c., "a poem," not in the theatrical sense), from Latin comoedia, from Greek komoidia "a comedy, amusing spectacle," probably from komodios "actor or singer in the revels," from komos "revel, carousal, merry-making, festival," + aoidos "singer, poet," from aeidein "to sing," related to oide (see ode).
The passage on the nature of comedy in the Poetic of Aristotle is unfortunately lost, but if we can trust stray hints on the subject, his definition of comedy (which applied mainly to Menander) ran parallel to that of tragedy, and described the art as a purification of certain affections of our nature, not by terror and pity, but by laughter and ridicule. [Rev. J.P. Mahaffy, "A History of Classical Greek Literature," London, 1895]
The classical sense of the word, then, was "amusing play or performance," which is similar to the modern one, but in the Middle Ages the word came to mean poems and stories generally (albeit ones with happy endings), and the earliest English sense is "narrative poem" (e.g. Dante's "Commedia"). Generalized sense of "quality of being amusing" dates from 1877.
Comedy aims at entertaining by the fidelity with which it presents life as we know it, farce at raising laughter by the outrageous absurdity of the situation or characters exhibited, & burlesque at tickling the fancy of the audience by caricaturing plays or actors with whose style it is familiar. [Fowler]
comely (adj.): "beautiful, handsome," c.1400, probably from Old English cymlic "lovely, splendid, finely made," from cyme "exquisite, glorious, delicate," from West Germanic *kumi- "delicate, feeble" (cf. Old High German chumo "with difficulty," chumig "weak, delicate;" German kaum "hardly, scarcely"). Or perhaps the modern word is from Middle English bicumelic (c.1200) "suitable, exquisite," literally "becomely" (cf. becoming).
comer (n.): "visitor," mid-14c., agent noun from come. Meaning "one showing promise" is attested from 1879. Phrase all comers "everyone who chooses to come" is recorded from 1560s.
comestible (n.): 1837, "article of food," from French comestible (14c.), from Late Latin comestibilis, from Latin comestus, past participle of comedere "eat up, consume," from com- "thoroughly" (see com-) + edere "to eat" (see edible). It was attested earlier as an adjective (late 15c.) meaning "fit to eat" but seems to have fallen from use 17c., and the word was reintroduced from French.
comet (n.): c.1200, from Old French comete (12c., Modern French comète), from Latin cometa, from Greek (aster) kometes, literally "long-haired (star)," from kome "hair of the head" (cf. koman "let the hair grow long"), of unknown origin. So called from resemblance of a comet's tail to streaming hair.
cometh (v.): obsolete or poetic 2nd and 3rd person singular of come, from Old English cymeð.
comeuppance (n.): also comeupance, 1859, presumably rooted in verbal phrase come up "present oneself for judgment before a tribunal" + -ance.
comfit (n.): early 14c., "sugarplum," from Old French confit "preserved fruit," from Latin confectum, from confectionem (see confection).
comfort (v.): late 13c., conforten "to cheer up, console," from Old French conforter "to comfort, to solace; to help, strengthen," from Late Latin confortare "to strengthen much" (used in Vulgate), from Latin com-, intensive prefix (see com-), + fortis "strong" (see fort). Change of -n- to -m- began in English 14c. Related: Comforted; comforting.
comfort (n.): c.1200, "feeling of relief" (as still in to take comfort in something); also "source of alleviation or relief;" from Old French confort (see comfort (v.)). Replaced Old English frofor. Comforts (as opposed to necessities and luxuries) is from 1650s.
comfortable (adj.): mid-14c., "affording mental comfort," from Anglo-French confortable, from conforter "to comfort" (see comfort (v.)); also see -able. Meaning "offering physical comfort" is attested from 1769; that of "in a state of tranquil enjoyment" is from 1770.
comfortably (adv.): late 14c., "pleasantly, enjoyably," from comfortable + -ly (2). Meaning "in a state of comfort" is 1630s.
comforter (n.): mid-14c., "one who consoles or comforts," from Anglo-French confortour (Old French comforteor), from Vulgar Latin *confortatorem, agent noun from Late Latin confortare (see comfort (v.)). As a kind of scarf, from 1823; as a kind of coverlet, from 1832.
comfy (adj.): 1829, colloquial shortening of comfortable.
comic (adj.): late 14c., "of comedy in the dramatic sense," from Latin comicus "of comedy, represented in comedy, in comic style," from Greek komikos "of or pertaining to comedy," from komos (see comedy). Meaning "intentionally funny" first recorded 1791, and comedic (1630s) has since picked up the older sense of the word.
Speaking of the masters of the comedic spirit (if I call it, as he does, the Comic Spirit, this darkened generation will suppose me to refer to the animal spirits of tomfools and merryandrews) .... [G.B. Shaw, 1897]
Something that is comic has comedy as its aim or origin; something is comical if the effect is comedy, whether intended or not.
comic (n.): "a comedian" is from 1580s, from comic (adj.). Latin adjective comicus also meant "a comic poet, writer of comedies." Meaning "a comic book or comic strip" is from 1889 (Comic strip first attested 1920; comic book is from 1941). Comic relief is attested from 1825.
comical (adj.): early 15c., "comic," from comic (or Latin comicus) + -al (1). Meaning "funny" is from 1680s. Earlier Middle English had an identical word meaning "epileptic," from Latin morbus comitialis "epilepsy."
coming (n.): late 13c., verbal noun from come (v.). From mid-15c. as a past participle adjective.
comingle (v.): c.1600, the better (because mingle is not from Latin), but less-used, English form of commingle. Related: comingled; comingling.
Comintern (n.): "Third International," 1919, from contraction of Communist International.
comitatus: Latin collective of comes, comitem "a companion, an associate" (see count (n.)).
comity (n.): early 15c., "association," from French comité, from Latin comitas "courtesy, friendliness, kindness, affability," from comis "courteous, friendly, kind," of uncertain origin. Meaning "courtesy" in English is from 1540s. Phrase comity of nations attested from 1862: "The obligation recognized by civilized nations to respect each other's laws and usages as far as their separate interests allow."
comma (n.): 1520s as a Latin word, nativized by 1590s, from Latin comma "short phrase," from Greek komma "clause in a sentence," literally "piece which is cut off," from koptein "to cut off," from PIE root *kop- "to beat, strike" (see hatchet (n.)). Like colon (n.1) and period, originally a Greek rhetorical term for a part of a sentence, and like them it has been transferred to the punctuation mark that identifies it.
command (v.): c.1300, from Old French comander "to order, enjoin, entrust" (12c.), from Vulgar Latin *commandare, from Latin commendare "to recommend, entrust to" (see commend), altered by influence of Latin mandare "to commit, entrust" (see mandate (n.)). Replaced Old English bebeodan. Related: Commanded; commanding.
command (n.): c.1400, "order, command," from Old French comand (14c.), from comander (see command (v.)). Meaning "control, authority" is from mid-15c.
commandant (n.): 1680s, from French commandant "the one commanding" originally "commanding," present participle of commander (Old French comander) "to order, enjoin;" see command (v.). Similar formation in Spanish and Italian comandante.
commandeer (v.): 1881, from Dutch (especially Afrikaans) kommandeeren "to command" (for military service), from French commander (see command (v.)). Related: Commandeered; commandeering.
commander (n.): early 14c., comandur, from Old French comandeor, from comander (see command (v.)). Commander in chief attested from 1650s.
commanding (adj.): late 15c. (in astronomy), present participle adjective from command (v.). Meaning "nobly dignified" is from 1590s. Meaning "dominant by virtue of size or position" is from 1630s. Related: Commandingly (mid-15c.).
commandment (n.): late 13c., "an order from an authority," from Old French comandement "order, command," from Latin *commandamentum, from *commandare (see command (v.)). Pronounced as four syllables until 17c.
Of þe x commandements ... þe first comondement is þis, O God we ssul honuri [c.1280]
commandments (n.): short for The Ten Commandments, attested from late 13c. In Old English they were ða bebodu.
commando (n.): Afrikaans, "a troop under a commander," from Portuguese, literally "party commanded" (see command (v.)); in use c.1809 during the Peninsula campaign, then from 1834, in a South African sense, of military expeditions of the Boers against the natives; modern sense is from 1940 (originally shock troops to repel the threatened German invasion of England), first attested in writings of Winston Churchill, who could have picked it up during the Boer War. Phrase going commando "not wearing underwear" attested by 1996, U.S. slang, perhaps on notion of being ready for instant action.
comme il faut: 1756, French, literally "as it should be;" from comme "as, like, how," from Old French com, from Vulgar Latin quomo, from Latin quomodo "how? in what way?," pronomial adverb of manner, related to quam "how much?," qui "who" (see who).