adjective
that must be kept completely secret, especially from other governments :
This information has been classified top secret.
top-secret documents
adjective
that must be kept completely secret, especially from other governments :
This information has been classified top secret.
top-secret documents
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005