the act of allying or state of being allied.

a formal agreement or treaty between two or more nations to cooperate for specific purposes.

a merging of efforts or interests by persons, families, states, or organizations

an alliance between church and state.

the persons or entities so allied.

marriage or the relationship created by marriage between the families of the bride and bridegroom.

correspondence in basic characteristics; affinity

the alliance between logic and metaphysics.

noun

antagonism , discord , disunion , divorce , estrangement , hostility , rebellion , separation , war

noun

accord , affiliation , affinity , betrothal , bond , coalition , coherence , collaboration , collusion , combination , communion , compact , concord , concurrence , confederacy , confederation , congruity , conjunction , connection , consanguinity , cooperation , engagement , entente , federation , fraternization , friendship , interrelation , kinship , league , marriage , matrimony , membership , mutuality , pact , participation , partnership , relation , support , tie , treaty , union , anschluss , bloc , cartel , organization , agreement , association , axis , body , consociation , consortion , consortium , covenant , fusion , monopolization , monopoly , relationship , understanding