Of or pertaining to a class action.

(US) A reduced-rate mail service for printed matter. / (Britain, historical) The cheapest accommodation on a train or ship.

(astronomy) A classification of stars depending on their spectra and luminosity; usually one of O, B, A, F, G, K, M.

A class of people in a society characterized by low incomes, low level of education, high unemployment and, as a result of these, a low social status.

(linguistics) A grammatical category similar to gender in which nouns may be organised according to meaning, such as sex, animacy or shape. This is a prominent feature of some of the world's languages, notably the Bantu language family.

(US) A person in a school's student council who takes minutes at meetings etc.

(US) A former class of mail consisting mostly of heavier printed matter.

A social and economic demographic, commonly identified as part of the upper middle class. / (in the plural) The groups in society composed of highly educated professionals.

Alternative spelling of working-class

The social class of those who perform physical work for a living, as opposed to the professional or middle class, the upper class, or others.