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Definition of factor
- 3 Physiology any of a number of substances in the blood, mostly identified by numerals, which are involved in coagulation. See factor VIII.
- 1 Mathematicsanother term for factorize.
late Middle English (meaning 'doer, perpetrator,' also in the Scots sense 'agent'): from French facteur or Latin factor, from fact- 'done', from the verb facere