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
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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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
It says that economic risk cannot be quantified so easily as modern finance
  theory presumes.
The effects of oceanic noise pollution are still being quantified.
Genius was precisely what could never be quantified.
Good teaching can't be quantified at the college level.
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