n.  1.  (Math.) The number by which the dividend is divided.

Noun  1.  divisor  one of two or more integers that can be exactly divided into another integer; "what are the 4 factors of 6?" Synonyms: factor 
2.  divisor  the number by which a dividend is divided 
divisor  A quantity that evenly divides another quantity. Unless otherwise stated, use of this term implies that the quantities involved are integers. (For nonintegers, the more general term factor may be more appropriate.) Example: 3 is a divisor of 15. Example: 3 is not a divisor of 14. 