reciprocality principle

n. 1. In neo-Jungian psychology, the idea that everything expresses itself as two polar opposites. 2. In information processing, the idea that the generation of new artifact types is mediated by the transformation of relationships among agents, and the generation of new artifact types mediates the transformation of relationships among agents. 3. In law, the idea that the courts of one country will recognize the legal proceedings of another country if that country recognizes the legitimacy of its legal proceedings.