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English definition of “action”

action

noun [C or U] (LEGAL PROCESS)    /ˈæk.ʃən/ specialized
C1 a legal process that is decided in a law court: a libel action She brought an action (for negligence) against the hospital. A criminal action was brought against him. The book was halted in South Africa by a threat of legal action.Court cases, orders and decisions
(Definition of action noun (LEGAL PROCESS) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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