Coun"ter*part` (koun"t?r-p?rt`), n.
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 supplements
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.