1786, Latin, "enjoy the day," literally "pluck the day (while it is ripe)," an aphorism from Horace ("Odes" I.xi). From second person present imperative of carpere "seize" (from PIE root *kerp- "to gather, pluck, harvest") + accusative of dies "day" (from PIE root *dyeu- "to shine").

1510s, "by the day, in each day," Latin, "by the day," from per (see per) + diem, accusative singular of dies "day" (from PIE root *dyeu- "to shine"). As a noun from 1809, "amount or allowance of so much every day."

Proto-Indo-European root meaning "to gather, pluck, harvest."

It forms all or part of: carpe diem; carpel; carpet; carpo- (1) "fruit;" excerpt; harvest; scarce; scarcity.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit krpana- "sword," krpani "shears;" Greek karpos "fruit," karpizomai "make harvest of;" Latin carpere "to cut, divide, pluck;" Lithuanian kerpu, kirpti "to cut;" Middle Irish cerbaim "cut;" Old English hærfest "autumn."

type of freshwater fish, late 14c., from Old French carpe "carp" (13c.) and directly from Vulgar Latin *carpa (source also of Italian carpa, Spanish carpa), from a Germanic source (compare Middle Dutch carpe, Dutch karper, Old High German karpfo, German Karpfen "carp"); possibly the immediate source is Gothic *karpa. A Danube fish (hence the proposed East Germanic origin of its name), introduced in English ponds 14c. Lithuanian karpis, Russian karp are Germanic loan words.

 "Shrove Tuesday, last day of carnival, day of eating and merrymaking before the fasting season of Lent," 1690s, French, literally "fat Tuesday," from mardi "Tuesday" (12c. in Old French, from Latin Martis diem "day of the planet Mars;" see Tuesday) + gras "fat," from Latin crassus, "thick," which is of unknown origin.

"to cause (time) to pass (without dullness)," 1630s, earlier "to occupy or engage (someone or something) for a period of time" (c. 1600), new formation from while (n.), not considered to be from Middle English hwulen "to have leisure," which is from a Germanic verb form of while (n.) (compare German weilen "to stay, linger"). An association with phrases such as Shakespearean beguile the day, Latin diem decipere, French tromper le temps "has led to the substitution of WILE v by some modern writers" [OED] (see wile (v.)).

coined 1959 by German-born biologist Franz Halberg, from Latin circa "about" (alternative form of circum "round about;" see circum-) + diem, accusative singular of dies "day" (from PIE root *dyeu- "to shine"). The original use is in circadian rhythm.

Proto-Indo-European root meaning "to shine," in derivatives "sky, heaven, god."

It forms all or part of: adieu; adios; adjourn; Asmodeus; circadian; deific; deify; deism; deity; deodand; deus ex machina; deva; dial; diary; Diana; Dianthus; diet (n.2) "assembly;" Dioscuri; Dis; dismal; diurnal; diva; Dives; divine; joss; journal; journalist; journey; Jove; jovial; Julia; Julius; July; Jupiter; meridian; Midi; per diem; psychedelic; quotidian; sojourn; Tuesday; Zeus.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit deva "god" (literally "shining one"); diva "by day;" Avestan dava- "spirit, demon;" Greek delos "clear;" Latin dies "day," deus "god;" Welsh diw, Breton deiz "day;" Armenian tiw "day;" Lithuanian dievas "god," diena "day;" Old Church Slavonic dini, Polish dzień, Russian den "day;" Old Norse tivar "gods;" Old English Tig, genitive Tiwes, name of a god.