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clearance

noun [U] (OFFICIAL PERMISSION)
 
 
/ˈklɪə.rəns/ US  /ˈklɪr.əns/

Definition

official permission for something or the state of having satisfied the official conditions of something: The plane will be taking off as soon as it gets clearance. To visit the prison, you'll need security clearance.Allowing and permitting
(Definition of clearance noun (OFFICIAL PERMISSION) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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