reciprocity

This term describes a social or political equilibrium where a gesture or privilege is returned in kind. It carries a strong connotation of fairness and obligation, suggesting that a benefit received creates a psychological or legal debt that must be repaid to maintain the relationship.

In diplomatic and legal contexts, it refers to a formal arrangement where two parties grant each other identical rights. This differs from simple exchange by emphasizing the symmetry and the systemic nature of the agreement, ensuring that neither party holds an unfair advantage.