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1.
1. one of two corresponding copies of a legal instrument
2. duplicate
3. a thing that fits another perfectly
The blond daughter was as beautiful as her motherly counterpart (indicating the strong resemblance between a mother and daughter).
by gensoukai November 06, 2009
 
2.
1. An awesome Rush album released in 1993 that marked their return to guitar-based rock
2. Two things that go together
1. I was listening to Counterparts today and it was awesome!
2. Peanut butter and jelly are unlikely, but eternal counterparts.
by UrbanDictator June 03, 2006
 
3.
Dan and Patti
Dan and Patti are couterparts because Dan said so.
by Patti July 11, 2003