Definition of "alliance" in English

noun

1. (uncountable) The state of being allied.

2. (countable) The act of allying or uniting.

3. (countable) A union or connection of interests between families, states, parties, etc., especially between families by marriage and states by compact, treaty, or league.

   • matrimonial alliances
   • an alliance between church and state, or between two countries

4. (countable) Any union resembling that of families or states; union by relationship in qualities; affinity.

5. (with the definite article) The persons or parties allied.

6. (taxonomy, dated) Synonym of cohort (“group of orders of organisms”).

verb

1. (obsolete) To connect or unite by alliance; to ally.