∙ Of a feeling, action or such: mutual, uniformly felt or done by each party towards the other or others; two-way.
∙ Mutually interchangeable.
∙ expressing mutual action, applied to pronouns and verbs; also in a broad sense: reflexive grammar
∙ Used to denote different kinds of mutual relation; often with reference to the substitution of reciprocals for given quantities. mathematics
∙ contrary or opposite
Noun
∙ 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. arithmetic