verb (used with object), quantified, quantifying.
to determine, indicate, or express the quantity of.
Logic. to make explicit the quantity of (a proposition).
to give quantity to (something regarded as having only quality).

1830–40; < Medieval Latin quantificāre, equivalent to Latin quant(us) how much + -ificāre -ify

quantifiable, adjective
quantifiably, adverb
quantification, noun
nonquantifiable, adjective
unquantifiable, adjective
unquantified, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
quantify (ˈkwɒntɪˌfaɪ)
vb , -fies, -fying, -fied
1.  to discover or express the quantity of
2.  logic to specify the quantity of (a term) by using a quantifier, such as all, some, or no
[C19: from Medieval Latin quantificāre, from Latin quantus how much + facere to make]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

c.1840, as a term in logic, from M.L. quantificare, from L. quantus "how much" + facere "to make" (see factitious). Lit. sense of "determine the quantity of, measure" is from 1878.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Agricultural scientists, followed by farmers, began to conceptualize farming as
  a strictly quantifiable venture.
Why bicycle messengers gather with such pride has little to do with the
  quantifiable rewards of their job.
No, there's something else here, something less quantifiable and more difficult
  to illuminate.
So an important question is whether there are any quantifiable principles
  behind our choice of ingredient combinations.
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