a condition, force, or fact that actively contributes to a result
in mathematics, one of two or more numbers or quantities that can be multiplied together to produce a given number or quantity
formerly, in biology, a gene
in physiology, a substance in the blood that causes it to clot
a person who acts for another; an agent
an organization that purchases a manufacturer's invoices for less than their face value and becomes responsible for collecting payment from customers
chiefly Scot a land agent
[Middle English via French from Latin factor doer, from facere to make, do]