reciprocal
re-cip-ro-cal
noun
A number or quantity related to another such that their product is one.
"The reciprocal of 2 is 1/2."
adjective
Given, felt, or done in return; mutual or corresponding.
"They have a reciprocal agreement."
Thesaurus
Synonyms: mutual, correlative, bilateral, interactional, reciprocatory, reciprocative, trilateral, interactive, reciprocal cross, multiplicative inverse, inverse
Antonyms: nonreciprocal