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.