1. [adjective] Of a feeling, action or such: mutual, uniformly felt or done by each party towards the other or others; two-way.
2. [adjective] Mutually interchangeable.
3. [adjective] (grammar) Reflexive; applied to pronouns and verbs, but sometimes limited to pronouns that express mutual action.
4. [adjective] (math) Used to denote different kinds of mutual relation; often with reference to the substitution of reciprocals for given quantities.
5. [adjective] Contrary or opposite
6. [noun] (arithmetic) Of a number, the number obtained by dividing 1 by the given number; the result of exchanging the numerator and the denominator of a fraction.
7. [noun] Something (a term or expression or concept) that has a reciprocal relation to something else; 'risk is the reciprocal of safety'.
8. [noun] (mathematics) one of a pair of numbers whose product is 1: the reciprocal of 2/3 is 3/2; the multiplicative inverse of 7 is 1/7.
9. [noun] Hybridization involving a pair of crosses that reverse the sexes associated with each genotype.
10. [adjective] Concerning each of two or more persons or things; especially given or done in return; 'reciprocal aid'; 'reciprocal trade'; 'mutual respect'; 'reciprocal privileges at other clubs'.
11. [adjective] Of or relating to the multiplicative inverse of a quantity or function; 'the reciprocal ratio of a:b is b:a'.
