Longman Dictionary of Contemporary English homepage

alliance

noun
     
al‧li‧ance W3 [countable]
1 an arrangement in which two or more countries, groups etc agree to work together to try to change or achieve something
alliance with
Britain's military alliance with her NATO partners
alliance between
the possibility of a political alliance between the two parties
make/enter into/form/forge an alliance (=agree to work together)
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
3

in alliance (with somebody/something)

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.
4 formal a close relationship, especially a marriage, between people

➔ unholy alliance

at unholy (1)

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