/di nom"euh nay'teuhr/ , n.
1. Arith. that term of a fraction, usually written under the line, that indicates the number of equal parts into which the unit is divided; divisor. Cf. numerator (def. 1).
2. something shared or held in common; standard.
3. Archaic. a person or thing that denominates.
[ 1535-45; denominator, equiv. to L denomina ( re ) (see DENOMINATE) + -tor -TOR ]