Definitions
1.nounThe characteristic of being reciprocal, e.g. of a relationship between people."In a friendship, reciprocity occurs where the contribution of each party meets the expectations of the other party."
2.nounA reciprocal relationship.
3.nounA relation of mutual dependence or action or influence.
4.noun(grammar) A reciprocal construction involves two noun phrases where each of the participants occupies both the role of agent and patient with respect to the other. see: Wikipedia:Reciprocal pronoun.
5.nounThe mutual exchange of rights, privileges or obligations between nations. see: Wikipedia:Reciprocity (international relations).
6.nounThe responses of individuals to the actions of others.