Definition of "reciprocity"

reciprocity

noun
countable and uncountable, plural reciprocities
1. The characteristic of being reciprocal, e.g. of a relationship between people.
  Quotations
  There might be benefit on one side, and obligation on the other; but their reciprocity of affection, their mutual exchange of small kindnesses—those strongest rivets of common attachment—were no more.
  1834, L[etitia] E[lizabeth] L[andon], Francesca Carrara. […], volume I, London: Richard Bentley, […], (successor to Henry Colburn), pages 111–112
2. A reciprocal relationship.
3. A relation of mutual dependence or action or influence.
4. (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. (international law) The mutual exchange of rights, privileges or obligations between nations. see: Wikipedia:Reciprocity (international relations).
6. (psychology) The responses of individuals to the actions of others.