C1 [ C ] a group of organizations, countries, regions, etc. that have joined together to form a larger organization or government同盟,联盟;联邦
[ U ] the act of forming a federation结成联邦;结盟
More examples
The trade federation promotes cooperation between local businesses.
The chairmen are proposing that a federation of the two leagues should take place.
The organization was formed in 1982 by the federation of three separate firms.
Opponents argue that European federation shifts power away from nation states.
A federation of charities have launched a new campaign against heart disease.
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