International relations

Relation, a person to whom one is related, i.e. a family member (see also Kinship)

Interpersonal relationship

Intimate relationship

Relation (mathematics), a generalization of arithmetic relations, such as "=" and "<", that occur in statements, such as "5 < 6" and "2 + 2 = 4". See also binary relation, triadic relation, relational algebra, theory of relations.

In the relational model of databases, a set of tuples (also called rows), otherwise known as a table.

Relation, in logic and philosophy, a property or predicate ranging over more than one argument. See also Logic of relatives, Relation of ideas, Relational theory, Relational philosophy.