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From Biology-Online Dictionary | Biology-Online Dictionary
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noun, plural: factors

(1) (biology) A substance that takes part in a biochemical reaction (e.g. blood-clotting factors) or a biological process (e.g. growth factors)

(2) (ecology) A component in the environment (e.g. biotic factors)

(3) (general) An element of something; a variable; one that causes or contributes to produce an outcome

(4) (genetics) Former name of gene or cistron


Word origin: Latin factor (a doer, maker, performer)

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