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Synonyms for Allied (same or very similar meaning)

WordNet sense 1 (united in a confederacy or league):
confederate, confederative

WordNet sense 2 (characterized by unity; being or joined into a single entity):

WordNet sense 3 (connected by kinship, common origin, or marriage):

WordNet sense 4 (brought into agreement or cooperation on the side of a faction, party, or cause):

From the ODE community, based on WordNetadd/edit