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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.
See equivalence relation, partial ordering, pre-order, total ordering.