Corresponding relation.

(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.

(databases) A database consisting of separate tables, having explicitly defined relationships, and whose elements may be selectively combined as the results of queries.

(idiomatic) Behaviour of a sexual nature between one or more individuals.

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

plural of relational database

(semantics) A term that, together with another term, forms a pair of opposite role names in a relationship, such as parent and child.

(linguistics) Any of various possible semantic relations between a verb and its arguments.

(mathematics) an equation that recursively defines a sequence; each term of the sequence is defined as a function of the preceding terms.