The complementary individual of a pair; a counterpart; a mate. A person matched against another specified person in combat; one of a pair of…

A thing which makes a pair with another; a counterpart, a twin.

Each of two things having a reciprocal relation such that the one necessarily implies, or is complementary to, the other.

Either of a matched pair of things; a counterpart.

One of two parts which fit together and complement each other; = counterpart, n. 4.

One of two parts which fit and complete each other; a person or thing forming a natural complement to another.

Each of two things so related that the one necessarily implies or is complementary to the other.

Each of the two corresponding halves or parts of anything; a thing, or part, that exactly fits or agrees with another thing or corresponding part…

A thing that corresponds or answers to something else; a correlative.

Something which, when added, completes or makes up a whole; each of two parts which mutually complete each other, or supply each other's deficiencies.

a person or (occasionally) organization holding an equivalent place or fulfilling an equivalent role to another specified person or organization in…

= opposite number n. at opposite, n. adj.adv. prep.compounds. Occasionally: a sweetheart, partner, or spouse.