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


top secret

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