classified

verb

1. (form-of, participle, past)simple past and past participle of classify

   “Make sure all the field observations are classified by species.”

adj

1. Sorted into classes or categories.
2. Formally assigned by a government to one of several levels of sensitivity, usually (in English) top secret, secret, confidential, and, in some countries, restricted; thereby making disclosure to unauthorized persons illegal.

   “We do not discuss specific interrogation techniques because they are classified information.”

   “Charlie: Where did you see this? Maverick: That's classified. I could tell you, but then I'd have to kill you. Charlie: I have Top Secret clearance. The Pentagon sees to it that I know more than you.”

3. Not meant to be disclosed by a person or organization.

   “I won't say who I'm going to the prom with; that's classified.”

noun

1. (informal)A classified advertisement in a newspaper or magazine.

   “He ran a classified for the tools he wanted to sell.”