A really fast thesaurus... with lots of synonyms.

(adj) :
of an action, feeling, etc, done, felt, etc, by each of two people to, on or towards the other; in the contrary or opposite way, order, or direction

(n) :
of a number, the number obtained by dividing 1 by the given number; the result of exchanging the numerator and the denominator of a fraction

"0.5 is the reciprocal of 2."

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for reciprocal:

(adj) :
of an action, feeling, etc, done, felt, etc, by each of two people to, on or towards the other; in the contrary or opposite way, order, or direction

(n) :
of a number, the number obtained by dividing 1 by the given number; the result of exchanging the numerator and the denominator of a fraction

"0.5 is the reciprocal of 2."