counterpart Meaning, Definition & Usage

  1. noun a person or thing having the same function or characteristics as another
    vis-a-vis; opposite number.
  2. noun a duplicate copy
    similitude; twin.

WordNet

Coun"ter*part` noun
Definitions
  1. A part corresponding to another part; anything which answers, or corresponds, to another; a copy; a duplicate; a facsimile.
    In same things the laws of Normandy agreed with the laws of England, so that they seem to be, as it were, copies or counterparts one of another. Sir M. Hale.
  2. (Law) One of two corresponding copies of an instrument; a duplicate.
  3. A person who closely resembles another.
  4. A thing may be applied to another thing so as to fit perfectly, as a seal to its impression; hence, a thing which is adapted to another thing, or which suplements it; that which serves to complete or complement anything; hence, a person or thing having qualities lacking in another; an opposite.
    O counterpart Of our soft sex, well are you made our lords. Dryden.

Webster 1913