Definitions
1.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."
2.noun(grammar) A construction expressing mutual action.
3.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"
4.adjectiveMutually interchangeable.
5.adjective(grammar) expressing mutual action, applied to pronouns and verbs; also in a broad sense: reflexive
6.adjectiveUsed to denote different kinds of mutual relation; often with reference to the substitution of reciprocals for given quantities.
7.adjectiveDone, given, felt, or owed in return"a reciprocal invitation to lunch"