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Definition of ally : 1. A relative; a kinsman.
2. Anything akin to another by structure, etc.
3. Anything associated with another as a helper; an auxiliary.
4. One united to another by treaty or league; - usually applied to sovereigns or states; a confederate.
5. See Alley, a marble or taw.
6. To connect or form a relation between by similitude, resemblance, friendship, or love.
7. To unite, or form a connection between, as between families by marriage, or between princes and states by treaty, league, or confederacy; - often followed by to or with.

Synonyms:

henchman, link, federate, protagonist, bind, champion, abetter _or_ abettor, retainer, coadjutor, accessory, align, attendant, follower, admirer, politics, combine, conjoin, booster, league, participator, helper

co-operate (part of speech: verb)

dovetail, interweave, overlap, collaborate, interplay, unite, pool, collude, co-operate, mesh, trade, concur, interlace, band, confederate, reciprocate, participate, share, intertwine, intermesh

friend (part of speech: noun)

company, friend, roommate, pal, sister, companion, chum, familiar, playmate, acquaintance, schoolmate, confidant, fellow, comrade, brother, intimate, classmate, partner, crony, co-worker, cousin, teammate, buddy, amigo, mate

join (part of speech: verb)

attach, consolidate, adhere, marry, merge, couple, annex, connect, splice, affiliate, bond, join, relate, amalgamate, juxtapose, wed, affix, abut, cling

confederate (part of speech: noun)

colleague, associate, study atassociate, supporter, assistant, collaborator, accomplice, abettor

Usage examples: