quintessence
Origin
PIE word *pénkʷe From Middle English, borrowed from Middle French, from Medieval Latin quinta essentia (“fifth essence, aether”), equivalent to quint- + essence. "Essence" in this context is a synonym for "element". In pre-atomic/Aristotelian theory, there are four known elements or essences — Earth, Air, Fire and Water — and a putative fifth element (aether), which is considered to be of exceptional superior quality to the other four basic elements.
quirk
Middle English
First attested in the 1540s. Of uncertain origin. Possibly from Middle English *querk, from Old Norse kverk (“a bend or angle, especially below a cross-beam or below the chin, the bight of an axe", also "throat, gullet”), from Proto-Germanic *kwerkō (“throat, gullet”), from Proto-Indo-European *gʷerh₃- (“to devour; maw”). Cognate with Scots querk (“throat", also "any hollow in the body, such as an armpit, groin, instep, etc.”), Icelandic kverk (“interior angle”). Also partially from dialectal quirk, querk (“a whim, fancy, fuss, huff, complaint", also "to peevishly grumble, grunt, sigh, croak, die”), from Middle English querken, *quirken (“to choke”), from Old Norse kvirkja (“to choke, strangle”), from the same origin above. Related to dialectal querken, quirken (“to choke”). Likely not related to queer.
quisling
Origin
Named after Norwegian military officer Vidkun Quisling (1887–1945), who ruled the Nazi collaborationist government of Norway during World War Two. From Quislinus, Latinization of Quislin, based on the Danish place name Kvislemark. This term first appeared in 1940. The surname is seemingly supposed to mean "one who is from Kvislemark", and is equivalent to Kvisle(mark) + -ing (suffix designating a person of a certain origin or with certain qualities). However, the earlier form of the name, Quislinus/Quislin, appears to have been a fanciful coinage based upon Kvisle(mark) + Latin -inus (“suffix indicating a relationship of position, possession, or origin”), and only later on came to be reinterpreted as containing Norwegian -ing (“suffix designating a person of a certain origin or with certain qualities”). Kvislemark is composed of Danish kvissel (“cleft branch”) + mark (compare Danmark). kvissel itself is a derivative of Old Norse kvísl (“fork [as in a 'fork in the road']”), which ultimately comes (by dissimilation) from Proto-Germanic *twīsilō. Cognates include Old English twisla (“confluence, junction, fork of a river or road”) and Old High German zwisila (“forked implement, twig,
quotidian
Origin
From Anglo-Norman cotidian, cotidien, Middle French cotidian, cotidien, and their source, Latin cottīdiānus, quōtīdiānus (“happening every day”), from adverb cottīdiē, quōtīdiē (“every day, daily”), from an unattested adjective derived from quot (“how many”) + locative form of diēs (“day”).