What does alliance mean?
The definition of alliance
Al*li”ance, n.
Etym: [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.

Synonyms
— Connection; affinity; union; confederacy; confederation; league; coalition.

Al*li”ance, v. t.
To connect by alliance; to ally. [Obs.]