Definitions
1.AdjectiveOf a feeling, action or such: mutual, uniformly felt or done by each party towards the other or others; two-way."reciprocal love; reciprocal duties; a reciprocal invitation to lunch"
2.AdjectiveMutually interchangeable.
3.AdjectiveExpressing mutual action, applied to pronouns and verbs; also in a broad sense: reflexive.
4.AdjectiveUsed to denote different kinds of mutual relation; often with reference to the substitution of reciprocals for given quantities.
5.NounThe number obtained by dividing 1 by another given number; the result of exchanging the numerator and the denominator of a fraction."0.5 is the reciprocal of 2."
6.NounA construction expressing mutual action.