English

Definition of top secret adjective from the Oxford Advanced Learner's Dictionary

 

top secret

 adjective
adjective
BrE BrE//ˌtɒp ˈsiːkrət//
 
; NAmE NAmE//ˌtɑːp ˈsiːkrət//
 
 
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that must be kept completely secret, especially from other governments This information has been classified top secret. top-secret documents
See the Oxford Advanced American Dictionary entry: top secret