1840, from Medieval 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 the quantity of, measure" is from 1878. Related: Quantified; quantifying.
Can you quantify your results?
qualms
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quango
quantifiable
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quantity
quantum