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English definition of “secret”

secret

noun uk   /ˈsiː.krət/ us  
B1 [C] a piece of information that is only known by one person or a few people and should not be told to others: Why did you have to go and tell Bob about my illness? You just can't keep a secret, can you? A close couple should have no secrets from each other. Aren't you going to let me in on (= tell me) the secret? There's no secret (= everyone knows) about his homosexuality. She makes no secret of (= makes very clear) her dislike of her father. That restaurant is one of the best-kept secrets in London. [C] a fact about a subject that is not known: the secrets of the universe B2 [S] the particular knowledge and skills needed to do something very well: So what's the secret of being a good cook?

secret

adjective uk   /ˈsiː.krət/ us  
B1 If something is secret, other people are not allowed to know about it: The president escaped through a secret passage underneath the parliament building. We ought to keep these proposals secret from the chairman for the time being. This is top (= extremely) secret information. Do you think we'll manage to keep the surprise party secret from Mum until her birthday? [before noun] describes someone who has a particular habit, hobby, or feeling but does not tell or show other people that they do: a secret drinker a secret admirer
secretly
adverb uk   /-li/ us  
B1 She said she didn't care about it, but I believe she was secretly delighted. He was convicted on the evidence of secretly recorded phone conversations.
(Definition of secret from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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