Main entry: reciprocal, mutual
Definition: concerning each of two or more persons or things; especially given or done in return
Usage: reciprocal aid; reciprocal trade; mutual respect; reciprocal privileges at other clubs
Antonyms: nonreciprocal
Definition: not reciprocal
Main entry: reciprocal
Definition: of or relating to the multiplicative inverse of a quantity or function
Usage: the reciprocal ratio of a:b is b:a
Antonyms: direct
Definition: similar in nature or effect or relation to another quantity