binary relation

/B AY1 N ER0 IY0 R IY0 L EY0 SH AH0 N/

noun

1
(set theory, order theory, "on" a set A) A subset of the Cartesian product A×A (the set of ordered pairs (a, b) of elements of A, alternatively written as A²).
2
(set theory, order theory, "on" or "between" sets A and B) A subset of the Cartesian product A×B.

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