CLASSIFY

[verb] [T] - to divide (things) into groups according to typeThe books in the library are classified by/according to subject. [T]Would you classify this book under/as sociology or politics?Biologists classify animals and plants into groups.A classified ad (UK also small ad, US also want ad) is a small advertisement which is put by someone in a newspaper or a magazine because they want to sell or buy something or to find or offer a job.