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English definition of “arm”

arm

noun [C] (OF ORGANIZATION)    /ɑːm/ US  /ɑːrm/
An arm of an organization is a part of it that is responsible for a particular activity or place: The British company is one arm of a large multinational.Societies, clubs and organizations
(Definition of arm noun (OF ORGANIZATION) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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