1 one of the things that influences a decision, situation, etc 起因；缘由；因素: His unhappiness at home was a major factor in his decision to go abroad. 在家里郁郁不乐是他决定到国外去的一大原因。

2 (technical术语) (in mathematics) a whole number (except 1) by which a larger number can be divided （数学）因子，因子: 2, 3, 4 and 6 are factors of 12. 2、3、4、6都是12的因子。