Etymology
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Words related to quantity

*kwo- 
also *kwi-, Proto-Indo-European root, stem of relative and interrogative pronouns.

It forms all or part of: cheese (n.2) "a big thing;" cue (n.1) "stage direction;" either; hidalgo; how; kickshaw; neither; neuter; qua; quality; quandary; quantity; quasar; quasi; quasi-; query; quib; quibble; quiddity; quidnunc; quip; quodlibet; quondam; quorum; quote; quotidian; quotient; ubi; ubiquity; what; when; whence; where; whether; which; whither; who; whoever; whom; whose; why.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit kah "who, which;" Avestan ko, Hittite kuish "who;" Latin quis/quid "in what respect, to what extent; how, why," qua "where, which way," qui/quae/quod "who, which;" Lithuanian kas "who;" Old Church Slavonic kuto, Russian kto "who;" Old Irish ce, Welsh pwy "who;" Old English hwa, hwæt, hwær, etc.
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quantify (v.)

c. 1840, in logic, "make explicit the use of a term in a proposition by attaching all, some, etc.," from Modern Latin quantificare, from Latin quantus "as much," correlative pronominal adjective (see quantity) + combining form of facere "to make" (from PIE root *dhe- "to set, put"). Literal sense of "determine or mark the quantity of, measure" is by 1878. Related: Quantified; quantifying.

quantitation (n.)

"action of ascertaining the quantity of," 1952, from quantity + -ation, ending used in forming nouns of action. Related: Quantitate (v.), 1960.

quantitative (adj.)

1580s, "having quantity," from Medieval Latin quantitativus, from stem of Latin quantitas (see quantity). Meaning "measurable" is from 1650s. Related: Quantitatively; quantitativeness.

quantitive (adj.)

a rare variant of quantitative, 1650s, from quantity + -ive. Related: Quantitively.

quantum (n.)

1610s, "sum, amount," 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).

The word was introduced in physics directly from Latin by Max Planck, 1900, on the notion of "minimum amount of a quantity which can exist;" reinforced by Einstein, 1905. Quantum theory is from 1912; quantum mechanics, 1922. The term quantum jump "abrupt transition from one stationary state to another" is recorded by 1954; quantum leap "sudden large advance" (1963), is often figurative.