recurring in vicissitude; alternate.-done by each to the other; interchanging or interchanged; given and received; due from each to each; mutual; as, reciprocal love; reciprocal duties.-mutually interchangeable.-reflexive; -- applied to pronouns and verbs, but sometimes limited to such pronouns as express mutual action.-used to denote different kinds of mutual relation; often with reference to the substitution of reciprocals for given quantities. see the phrases below.-that which is reciprocal to another thing.-the quotient arising from dividing unity by any quantity; thus, / is the reciprocal of 4; 1/(a +b) is the reciprocal of a + b. the reciprocal of a fraction is the fraction inverted, or the denominator divided by the numerator.