Pronunciation: (nOO'mu-rā"tur, nyOO'-),[key] —n. 1. Arith.the term of a fraction, usually above the line, that indicates the number of equal parts that are to be added together; the dividend placed over a divisor: The numerator of the fraction 2/3 is 2. Cf. denominator (def. 1).
2. a person or thing that numbers.