Learner's definition of ALLIANCE
1 [count] : a union between people, groups, countries, etc. : a relationship in which people agree to work together
We need to form/forge/encourage a closer alliance between government and industry.
strengthen/weaken the alliance of western nations
There has been a pattern of shifting alliances in the political world.
The article condemns what some say is an unholy alliance between government and media.
2 [noncount] : the state of being joined in some activity or effort : the state of being allied 3 [count] : a group of people, countries, etc., that are joined together in some activity or effort