Definition of official secret in English:

official secret

Line breaks: of|fi¦cial se¦cret

Entry from British & World English dictionary

noun

British
A piece of confidential information that is important for national security: it is a crime to disclose an official secret

Definition of official secret in:

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Word of the day neoteny
Pronunciation: niːˈɒt(ə)ni
noun
retention of juvenile features in the adult animal