family compact. An agreement to further common interests made between related people or within a group that behaves as a family. • Historically, some international treaties among nations ruled by monarchs have been called family compacts because of intermarriage among the royal houses.
interstate compact. A voluntary agreement between states enacted into law in the participating states upon federal congressional approval. Cf. INTERSTATE AGREEMENT. [Cases: States
6. C.J.S. States §§ 31–32, 143.]