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]

unquantifiable (ʌnˈkwɒntɪˌfaɪəbəl)
not capable of being quantified

Collins English Dictionary - Complete & Unabridged 10th Edition
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Dictionary.com's 21st Century Lexicon
Main Entry:  unquantifiable
Part of Speech:  adj
Definition:  unable to be counted or to have a value assigned; impossible to determine the quantity of
Dictionary.com's 21st Century Lexicon
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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
We're not talking unquantifiable efficiency ratings.
These people have endured countless pages of contradicting evidence and an
  unquantifiable amount of rational arguments.
Uncertainty is a measure of how workers and businesses feel, which is
And it requires sacrificing today to ward off uncertain and unquantifiable
  future risks.
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