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clandestine

adjective
 
 
/klænˈdes.tɪn/ formal

Definition

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
 
 
/-li/ adverb
(Definition of clandestine adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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