alliancen.[OE. aliaunce, OF. aliance, F. alliance, fr. OF. alier, F. allier. See Ally, and cf. LL. alligantia.]1. The state of being allied; the act of allying or uniting; a union or connection of interests between families, states, parties, etc., especially between families by marriage and states by compact, treaty, or league; as, matrimonial alliances; an alliance between church and state; an alliance between France and England.()2. Any union resembling that of families or states; union by relationship in qualities; affinity.()The alliance of the principles of the world with those of the gospel. (C. J. Smith.)The alliance . . . between logic and metaphysics. (Mansel.)3. The persons or parties allied.(Udall.)()v. t. To connect by alliance; to ally.()