to identify by or divide into classes; to categorize / to declare something a secret, especially a government secret / To make classy

present participle of classify

That serves to classify

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

simple past tense and past participle of classify

Sorted into classes or categories.

plural of classified

A section of a newspaper, magazine or web site containing classified advertisements.

Third-person singular simple present indicative form of classify

Able to be classified.