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

Collins English Dictionary - Complete & Unabridged 10th Edition
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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
It is identical in texture and has a cleaner, more esteemed flavor than its
  wild counterpart.
If there's an arts and humanities counterpart to the science operation, it is
  well concealed.
The western counterpart of the tree swallow, the violet-green swallow has
  narrower wings and a shorter tail.
The interval between one note and its counterpart in the next cycle is called
  an octave.
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