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quantity [quantity 词源字典]: quantity: [14] Latin quantus meant ‘how much’ (it was a compound adjective formed from quī ‘who’). From it was derived the noun quantitās ‘extent, amount’, which passed into English via Old French quantite. Quantum [17], a noun use of the neuter form of the Latin adjective, originally denoted simply ‘amount’; its specific application to a ‘minimum amount of matter’ was introduced by Max Planck in 1900, and reinforced by Einstein in 1905.
=> quantum[quantity etymology, quantity origin, 英语词源]
piquant (adj.): 1520s, from Middle French piquant "pricking, stimulating, irritating," present participle of piquer "to prick, sting, nettle" (see pike (n.2)).
quantifiable (adj.): 1868, from quantify + -able. Related: Quantifiably.
quantification (n.): 1850, noun of action from quantify.
quantify (v.): 1840, from Medieval Latin quantificare, from Latin quantus "as much," correlative pronominal adjective (see quantity) + facere "to make" (see factitious). Literal sense of "determine the quantity of, measure" is from 1878. Related: Quantified; quantifying.
quantitation (n.): 1952, from quantity + -ation. Related: Quantitate.
quantitative (adj.): 1580s, "having quantity," from Medieval Latin quantitativus, from stem of Latin quantitas (see quantity). Meaning "measurable" is from 1650s. Related: Quantitatively.
quantitive (adj.): 1650s, from quantity + -ive. Related: Quantitively.
quantity (n.): early 14c., from Old French quantite, cantite (12c., Modern French quantité) and directly from Latin quantitatem (nominative quantitas) "relative greatness or extent," coined as a loan-translation of Greek posotes (from posos "how great? how much?") from Latin quantus "of what size? how much? how great? what amount?," correlative pronominal adjective, related to qui "who" (see who). Latin quantitatem also is the source of Italian quantita, Spanish cantidad, Danish and Swedish kvantitet, German quantitat.
quantum (n.): 1610s, "one's share or portion," from Latin quantum (plural quanta) "as much as, so much as; how much? how far? how great an extent?" neuter singular of correlative pronominal adjective quantus "as much" (see quantity). Introduced in physics directly from Latin by Max Planck, 1900; reinforced by Einstein, 1905. Quantum theory is from 1912; quantum mechanics, 1922; quantum jump is first recorded 1954; quantum leap, 1963, often figurative.
unquantifiable (adj.): 1888, from un- + quantifiable (adj.). Related: Unquantifiably.
quantal: "Composed of discrete units; varying in steps rather than continuously", Early 20th century: from quantum + -al.
quantitate: "Determine the quantity or extent of (something in numerical terms); quantify", 1960s: from quantity + -ate³.