cogitation
Origin
Latinism, likely a learned borrowing from Medieval Latin cogitatio, cogitationis, possibly influenced by or displacing an earlier doublet of cogitacion inherited from Middle English cogitacioun, from an Old French cogitaciun, from Vulgar Latin cōgitātiō, cōgitātiōnem; compare Middle French cogitatiun, French cogitation. All ultimately from verbal construction cōgitātus + -iō, from the perfect passive participle of Latin cōgitō (“to turn over in the mind; think, consider, ponder, meditate”), frequentative verb from con- (“together, with”) + agitō (“to put in constant motion, drive at something; devise, plot, contrive”), root from Proto-Italic *agō (“to drive, impel”) from Proto-Indo-European *h₂eǵ-.
cognition
Origin
From Middle English cognicion, cognicioun from Latin cognitiō (“knowledge, perception, a judicial examination, trial”), from cognitus, past participle of cognoscere (“to know”), from co- (“together”) + *gnoscere, older form of noscere (“to know”); see know, and compare cognize, cognizance, cognizor, cognosce, connoisseur.
coif
Origin
From Middle English coif, coife, coyf, coyfe, coyffe, from Old French coife, coiffe, from Late Latin cofia, from Proto-West Germanic *kuffju, related to Old High German kupphia, kupha, kupfe (“mug, hood, cap”), from Proto-Germanic *kuppijǭ (“cap, hat, bonnet, headpiece”), Proto-Germanic *kuppō (“vat, mug, cup”), from pre-Germanic *kubná-, from Proto-Indo-European *gup- (“round object, knoll”), from Proto-Indo-European *gew- (“to bend, curve, arch, vault”). Cognate with Middle High German kupfe (“cap, headgear, helmet”).