Definitions
from The American Heritage® Dictionary of the English Language, 4th Edition
 n. Mathematics The expression written above the line in a common fraction to indicate the number of parts of the whole.
 n. Mathematics An expression to be divided by another; a dividend.
 n. One that numbers; an enumerator.
from Wiktionary, Creative Commons Attribution/ShareAlike License
 n. The number or expression written above the line in a fraction (thus 1 in ½).
 n. An enumerator; someone who counts things.
from the GNU version of the Collaborative International Dictionary of English
 n. One who numbers.
 n. The term in a fraction which indicates the number of fractional units that are taken.
from The Century Dictionary and Cyclopedia
 n. One who numbers.
 n. In arithmetic, the number in a vulgar fraction which shows how many parts of a unit are taken.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
 n. the dividend of a fraction
Etymologies
Sorry, no etymologies found.
Examples

As the sample size increases, the denominator shrinks, and the ratio increases because the numerator is fixed.

The numerator is negative, it begins with 47845869850733698144899338333210878162030638218660 and ends with 57164275665935124168181176013725629647185402960697.
Wolfram Blog : Today We Broke the Bernoulli Record: From the Analytical Engine to Mathematica

But the numerator is not so simple; in fact it’s 57,675,292 digits long.
Wolfram Blog : Today We Broke the Bernoulli Record: From the Analytical Engine to Mathematica

Rational numbers consist of a signed integer known as the numerator, and a positive nonzero integer known as the denominator.

For a straightline demand curve, the numerator is the inverse of the slope of the line, equal to Q/P2P1.

This number is recorded as the denominator of a vulgar fraction of which the numerator is the number recorded for the specific serum.

Each letter in the dispatch was represented by a fraction, of which the numerator was the number of the letter in one of the lines of the song, and the denominator the number of the line.

For all volume statistics presented, the numerator is the total volume sold during the applicable period and the denominator is the number of calendar days during the applicable period.

For all operating statistics presented, the numerator is the total volume or sales for the period and the denominator is the number of calendar days for the period.

For all volume statistics presented, the numerator is the total volume sold during the year and the denominator is the number of calendar days during the applicable period.
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