An agent or representative.

(law) A factor is a commission agent, a financier of new business ventures, or a business organization that lends money on accounts receivable or buys and collects accounts receivable.

One of the elements, circumstances, or influences which contribute to produce a result.

(mathematics) Any of various objects multiplied together to form some whole.

(causal analysis) Influence; a phenomenon that affects the nature, the magnitude, and/or the timing of a consequence.

(economics) A resource used in the production of goods or services, a factor of production.

(Scotland) A steward or bailiff of an estate.

(transitive) To find all the factors of (a number or other mathematical object) (the objects that divide it evenly).

(of a number or other mathematical object, intransitive) To be a product of other objects.

(commercial, transitive) To sell a debt or debts to an agent (the factor) to collect.