One that enumerates; especially; a census taker.
ETYM Latin numerator: cf. French numérateur.
The dividend of a fraction.
The number or symbol that appears above the line in a vulgar fraction. For example, the numerator of 5/6 is 5. The numerator represents the fraction's dividend and indicates how many of the equal parts indicated by the denominator (number or symbol below the line) comprise the fraction.