a part corresponding to another part; anything which answers, or corresponds, to another; a copy; a duplicate; a facsimile.-one of two corresponding copies of an instrument; a duplicate.-a person who closely resembles another.-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.