- To become united with another country or group, especially for a political or military purpose.
- To join with others in a common cause.
Late middle english: from old french alier, from latin alligare "bind, tie to", from ad- "to" + ligare "bind".
- The two countries allied against a common enemy.
- He allied with other businessmen to form a company.
- The company allied with a competitor to increase market share.
- The two political parties allied to form a coalition government.
- The two countries allied to promote peace and stability.