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counterpart

[koun-ter-pahrt] /ˈkaʊn tərˌpɑrt/
noun
1.
a person or thing closely resembling another, especially in function:
Our president is the counterpart of your prime minister.
2.
a copy; duplicate.
3.
Law. a duplicate or copy of an indenture.
4.
one of two parts that fit, complete, or complement one another.
Origin
late Middle English
1425-1475
1425-75; late Middle English; see counter-, part
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for counter part

counterpart

/ˈkaʊntəˌpɑːt/
noun
1.
a person or thing identical to or closely resembling another
2.
one of two parts that complement or correspond to each other
3.
a person acting opposite another in a play
4.
a duplicate, esp of a legal document; copy
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 counter part

counterpart

n.

mid-15c., originally countre part "duplicate of a legal document," from Middle French contrepartie, from contre "facing, opposite" (see contra-) + partie "copy of a person or thing," originally fem. past participle of partir "to divide" (see party (n.)).

Online Etymology Dictionary, © 2010 Douglas Harper
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