(set theory, order theory, "on" a set A) A subset of the Cartesian product A×A (the set of ordered pairs (a, b) of elements of A).

(set theory) A binary relation that is reflexive, symmetric and transitive.

Corresponding relation.

(grammar) An adjective that defines a relation and not a qualification.

plural of relational community

A group of people whose members are linked by shared interests, practices, or identifications, rather than geographical proximity.

plural of relational adjective

The patterns of behaviour between ethnic groups of people / The branch of sociology that studies these patterns

The tasks of building, maintaining and exploiting good relationships between an organization and print and broadcast media organizations.

A person who is relation through birth, as opposed to marriage or adoption.