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an existing connection; a significant association between or among things:
the relation between cause and effect.

the various connections between peoples, countries, etc.:
foreign relations.
the various connections in which persons are brought together:
business and social relations.
sexual intercourse.

the mode or kind of connection between one person and another, between an individual and God, etc.
connection between persons by blood or marriage.
a person who is related by blood or marriage; relative:
his wife’s relations.
the act of relating, narrating, or telling; narration.
Law. a principle whereby effect is given to an act done at one time as if it had been done at a previous time.

a property that associates two quantities in a definite order, as equality or inequality.
a single- or multiple-valued function.

in / with relation to, with reference to; concerning:
It’s best to plan with relation to anticipated changes in one’s earnings.
the state or condition of being related or the manner in which things are related
connection by blood or marriage; kinship
a person who is connected by blood or marriage; relative; kinsman
reference or regard (esp in the phrase in or with relation to)
the position, association, connection, or status of one person or thing with regard to another or others
the act of relating or narrating
an account or narrative
(law) the principle by which an act done at one time is regarded in law as having been done antecedently
(law) the statement of grounds of complaint made by a relator
(logic, maths)

an association between ordered pairs of objects, numbers, etc, such as … is greater than …
the set of ordered pairs whose members have such an association


internal relation, a relation that necessarily holds between its relata, as 4 is greater than 2
external relation, a relation that does not so hold

relation re·la·tion (rĭ-lā’shən)

A logical or natural association between two or more things; relevance of one to another; connection.

The connection of people by blood or marriage; kinship.

A person connected to another by blood or marriage; a relative.

The positional relationship of the teeth or other structures in the mouth.

1. A subset of the product of two sets, R : A x B. If (a, b) is an element of R then we write a R b, meaning a is related to b by R. A relation may be: reflexive (a R a), symmetric (a R b => b R a), transitive (a R b & b R c => a R c), antisymmetric (a R b & b R a => a = b) or total (a R b or b R a).
See equivalence relation, partial ordering, pre-order, total ordering.
2. A table in a relational database.


Read Also:

  • Relational

    adjective 1. of or relating to relations. 2. indicating or specifying some relation. 3. Grammar. serving to indicate relations between various elements in a sentence, as prepositions, conjunctions, etc. Compare notional (def 6). adjective 1. (grammar) indicating or expressing syntactic relation, as for example the case endings in Latin 2. having relation or being related […]

  • Relational algebra

    database, theory A family of algebra with a well-founded semantics used for modelling the data stored in relational databases, and defining queries on it. The main operations of the relational algebra are the set operations (such as union, intersection, and cartesian product), selection (keeping only some lines of a table) and the projection (keeping only […]

  • Relational-database

    noun 1. an electronic database comprising multiple files of related information, usually stored in tables of rows (records) and columns (fields), and allowing a link to be established between separate files that have a matching field, as a column of invoice numbers, so that the two files can be queried simultaneously by the user. relational […]

  • Relational language

    language Any kind of programming language that specifies output in terms of some property and some arguments. For example, if Tom has two brothers, Dick and Harry, a relational language will respond to the query “Who is Tom’s brother?” with either Dick or Harry. Notice that unlike functional languages, relational languages do not require a […]

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