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| special point used to construct and define a conic section |
| family of curves including circles, ellipses, parabolas, and hyperbolas |
relation re·la·tion (rĭ-lā'shən)
n.
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.