[noo-muh-rey-ter, nyoo-]
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.

1535–45; < Late Latin numerātor a counter, numberer, equivalent to Latin numerā(re) to number + -tor -tor Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
numerator (ˈnjuːməˌreɪtə)
1.  maths Compare denominator the dividend of a fraction: the numerator of 7⁄8 is 7
2.  a person or thing that numbers; enumerator

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
numerator   (n'mə-rā'tər)  Pronunciation Key 
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 2/7 .
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary

numerator definition

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

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
First of all, the size of a ratio depends on the denominator as well as the numerator.
Thus letter on the top will be in the numerator and letters on the bottom will be in the denominator.
The numerator of the productivity equation, output, is hopelessly vague for
The performance rate is calculated by dividing the numerator by the denominator.
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