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al‧li‧ance W3
[countable]
[countable]1 an arrangement in which two or more countries, groups etc agree to work together to try to change or achieve something
make/enter into/form/forge an alliance (=agree to work together) 
The companies have formed an alliance to market the product.
The companies have formed an alliance to market the product.2 a group of two or more countries, groups etc who work together to achieve something : independent organizations and alliances
independent organizations and alliances3 if two groups, countries etc are in alliance, they work together to achieve something or protect each another : Relief workers in alliance with local charities are trying to help the victims.
in alliance (with somebody/something)
Relief workers in alliance with local charities are trying to help the victims.4 formal a close relationship, especially a marriage, between people
