Relation

Relation or relations may refer to:

General use

Kinship, relationship by genealogical origin
Social relations, in social science, social interaction between two or more individuals
International relations, strategies chosen by a state to safeguard its national interests and achieve its foreign policy objectives

Relation (philosophy), links between properties of an object
Finitary relation, term in set theory and logic, for a property that assigns truth values to k-tuples of individuals
Relation of Ideas, in the Humean sense, is the type of knowledge that can be characterized as arising out of pure conceptual thought and logical operations (in contrast to a Matter of Fact)
Relational theory, framework to understand reality or a physical system in such a way that the positions and other properties of objects are only meaningful relative to other objects
Relation (history of concept) a brief history of three types of relation

Relational algebra, an offshoot of first-order logic (and of algebra of sets), deals with a set of finitary relations which is closed under certain operators
Relation (mathematics), a generalization of arithmetic relations, such as "=" and "<", that occur in statements, such as "5 < 6" and "2 + 2 = 4"
Ternary relation, finitary relation in which the number of places in the relation is three. Ternary relations may also be referred to as 3-adic, 3-ary, 3-dimensional, or 3-place.
Theory of relations, treats the subject matter of relations in its combinatorial aspect, as distinguished from, though related to, its more properly logical study on one side and its more generally mathematical study on another

Relational quantum mechanics, an interpretation of quantum mechanics which treats the state of a quantum system as being observer-dependent, that is, the state is the relation between the observer and the system
Relation (journal), the first newspaper
Sexual relations, euphemistic term for human sexual activity