counterpart

[koun-ter-pahrt]
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:
1425–75; late Middle English; see counter-, part

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World English Dictionary
counterpart (ˈkaʊntəˌpɑːt)
 
n
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

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Etymonline
Word Origin & History

counterpart
1451, originally countre part "duplicate of a legal document," from O.Fr. contrepartie, from contre "facing, opposite" + partie "copy of a person or thing," originally fem. pp. of partir "to divide" (see party).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
In dry form, they're usually less expensive than their organic counterparts.
If those students go on to college, they are more likely than their white
  counterparts to be the first in their families to do so.
There is a regional variation, with inland areas being cooler in winter and
  warmer in summer than their coastal counterparts.
It is possible, however, that some university presses will prove more resilient
  than their commercial counterparts.
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