1
- a circumstance, fact, or influence that contributes to a result or outcome因素; 要素：
his skill was a factor in ensuring that so much was achieved
他的技能是确保取得这么大成绩的一个因素
she worked fast, conscious of the time factor.
考虑到时间因素, 她做得非常快。
1.1
- Biology a gene that determines a hereditary characteristic【生】遗传因子, 基因：
the Rhesus factor.
猕因子。
2
- a number or quantity that when multiplied with another produces a given number or expression系数 。
2.1
- Mathematics a number or algebraic expression by which another is exactly divisible【数】因子, 因数。
3
- a level on a scale of measurement测量水平。
3.1
- (with numeral) a sunscreen of the sun protection factor specified与数字连用防晒因子：
factor 30 sun cream.
防晒因子为30的护肤霜。
4
- Physiology any of a number of substances in the blood, mostly identified by numerals, which are involved in coagulation【生理】（血液中的）凝血因子。 见FACTOR VIII.
5
- a business agent; a merchant buying and selling on commission代理人; （收取佣金的）中间商。
5.1
- a company that buys a manufacturer's invoices at a discount and takes responsibility for collecting the payments due on them（以折扣价购买制造商的发票并负责到期收账的）代理公司, 代理商。
5.2
- chiefly Scottish a land agent or steward〈主苏格兰〉地产管理人, 管家。
5.3
- archaic an agent, deputy, or representative〈古〉代理人; 代表。
短语
the - factor
- used to indicate that something specified will have a powerful, though unpredictable, influence on a result or outcome…的决定性因素（指对结果会产生难以预测的重大影响的事物）：
the feel-good factor.
对未来应抱的乐观态度。
派生词
factorable
adjective词源
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.
短语动词
factor something in（或 out）
- include (or exclude) something as a relevant element when making a calculation or decision（计算或作决定时）把…作为相关因素计入（或排除）：
when the psychological costs are factored in, a different picture will emerge.
如果将心理成本计算在内, 情况就会不同。