Webster's English Dictionary

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counterpart

coun.ter.part \-.pa:rt\ n 1: one of two corresponding copies of a legal 
   instrument : DUPLICATEM 2a: a thing that fits another perfectly  2b: 
   something that completes : COMPLEMENT  3a: one remarkably similar to 
   another  3b: one having the same function or characteristics as another : 
   EQUIV ALENT