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English definition of “clandestine”

clandestine

adjective uk   /klænˈdes.tɪn/ formal us  
planned or done in secret, especially describing something that is not officially allowed: The group held weekly clandestine meetings in a church. He has been having a clandestine affair with his secretary for three years. She undertook several clandestine operations for the CIA.Secrecy and privacy
clandestinely
adverb uk   /-li/ us  
(Definition of clandestine from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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