English definition of “secret”
/ˈsiːkrət/ noun [C]
› something that you tell no one about or only a few people: I'm having a party for him but it's a secret. Can you keep a secret?
the secret › the best way of achieving something: That's the secret to making a good cocktail. So what's the secret of your success?
in secret › without telling other people: For years they met in secret.