mid-15c., "to invest with a quality," from Middle French qualifier (15c.) and directly from Medieval Latin qualificare "attribute a quality to; make of a certain quality," from Latin qualis "of what sort?," correlative pronominal adjective (see quality) + combining form of facere "to make" (from PIE root *dhe- "to set, put"). Meaning "to limit, modify" is from 1530s. Sense of "be fit for a job" first appeared 1580s. Related: Qualified; qualifying.
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