noun

- Arithmetic. 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.Compare denominator(def 1).
- a person or thing that numbers.

noun

- maths the dividend of a fractionthe numerator of 7/8 is 7 Compare denominator
- a person or thing that numbers; enumerator

1540s, from Late Latin numerator “counter, numberer,” agent noun from numerat-, past participle stem of numerare “to count, number,” from numerus “a number” (see number (n.)).

- A number written above or to the left of the line in a common fraction to indicate the number of parts of the whole. For example, 2 is the numerator in the fraction 27.

In mathematics, the number that appears on the top of a fraction. In the fraction 2/3, the numerator is 2. (Compare denominator.)