secretsecretsecrets1nounsomething that you do not or must not tell other people: I can't tell you where I'm going – it's a secret. Can you keep a secret (= not tell other people)?in secretwithout other people knowing: They met in secret.secretsecret2adjectiveIf something is secret, other people do not or must not know about it: They kept their wedding secret (= they did not tell anybody about it).a secret meeting