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comparator

[kuh m-par-uh-ter, kom-puh-rey-] /kəmˈpær ə tər, ˈkɒm pəˌreɪ-/
noun
1.
any of various instruments for making comparisons, as of lengths or distances, tints of colors, etc.
2.
Electronics. a circuit for comparing two signals, as readings of duplicate information stored in a digital computer, and for giving an indication of agreement or disagreement between them.
Origin
1880-1885
1880-85; < Late Latin comparātor a comparer. See compare, -tor
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for comparator

comparator

/kəmˈpærətə/
noun
1.
any instrument used to measure a property of a system by comparing it with a standard system
2.
an electric circuit that compares two signals and gives an indication of the extent of their dissimilarity
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for comparator
n.

1883, agent noun in Latin form from compare.

Online Etymology Dictionary, © 2010 Douglas Harper
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