de·nom·i·na·tor

[dih-nom-uh-ney-ter]
noun
1.
Arithmetic. that term of a fraction, usually written under the line, that indicates the number of equal parts into which the unit is divided; divisor. Compare numerator ( def 1 ).
2.
something shared or held in common; standard.
3.
Archaic. a person or thing that denominates.

Origin:
1535–45; < Medieval Latin dēnōminātor, equivalent to Latin dēnōminā(re) (see denominate) + -tor -tor

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
denominator (dɪˈnɒmɪˌneɪtə) [Click for IPA pronunciation guide]
 
n
1.  Compare numerator the divisor of a fraction, as 8 in 7⁄8
2.  archaic a person or thing that denominates or designates

Collins English Dictionary - Complete & Unabridged 10th Edition
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00:10
Denominator is always a great word to know.
So is additive inverse of a number. Does it mean:
opposite of a number
fraction whose denominator is a power of 10
Etymonline
Word Origin & History

denominator
1540s, in mathematics, from M.L. denominator, agent noun from denominare (see denomination).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
denominator   (dĭ-nŏm'ə-nā'tər)  Pronunciation Key 
The number below or to the right of the line in a fraction, indicating the number of equal parts into which one whole is divided. For example, in the fraction 2/7 , 7 is the denominator.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary
denominator [(di-nom-uh-nay-tuhr)]

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

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
But the common denominator is nearly always the loss of jobs.
Both delay and decision-by-lowest-denominator would be a disaster.
Thus letter on the top will be in the numerator and letters on the bottom will be in the denominator.
There was no common denominator to their acquisitions.
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