1.Definition: information known only to a special group

"The secret of Cajun cooking"

Related Noun(s):arcanum

Category: General

2.Definition: something that baffles understanding and cannot be explained

"How it got out is a mystery", "It remains one of nature's secrets"

Related Noun(s):enigma, mystery

Category: General

3.Definition: something that should remain hidden from others (especially information that is not to be passed on)

"The combination to the safe was a secret", "He tried to keep his drinking a secret"

Category: General