reciprocity

noun

1. (countable, uncountable)The 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.”

   “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.”

2. (countable, uncountable)A reciprocal relationship.

   “Near-synonym: reciprocation”

3. (countable, uncountable)A relation of mutual dependence or action or influence.
4. (countable, uncountable)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. (countable, uncountable)The mutual exchange of rights, privileges or obligations between nations. see: Wikipedia:Reciprocity (international relations).
6. (countable, uncountable)The responses of individuals to the actions of others.