divisor

noun

1. In an expression involving division, the number by which another number is being divided.

   “In "42 ÷ 3" the divisor is the 3.”

2. An integer that divides another integer an integral number of times, the former being called a divisor of the latter.

   “10 is a divisor of 100, but not of 101.”

   “The positive divisors of 6 are 1, 2, 3 and 6.”

3. (broadly)An integer that divides another integer an integral number of times, the former being called a divisor of the latter.
4. Any of several kinds of formal object associated to an algebraic variety, scheme, etc., which play a role similar to that of homology or cohomology groups in the study of topological spaces.
5. Any of several kinds of formal object associated to an algebraic variety, scheme, etc., which play a role similar to that of homology or cohomology groups in the study of topological spaces.
6. Any of several kinds of formal object associated to an algebraic variety, scheme, etc., which play a role similar to that of homology or cohomology groups in the study of topological spaces.