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

(chiefly Britain) educated people with liberal opinions and attitudes

Not of the elite, of the peasantry or working-class. / Unrefined.

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

An excellent performance. / Someone or something whose performance is excellent. / (sometimes sarcastically) Someone or something who is generally well-mannered, conscientious, etc.

plural of character class

(role-playing games) One of a number of pre-determined groups into which characters in role-playing games are grouped, based on the focus of their skills.

(idiomatic) A student who frequently makes jokes or pokes fun; a wiseacre.

(neutral or mildly positive connotation) Of a standard or grade one level below the best. / (negative connotation) Inferior in quality or standing.

Of a standard that ranks among the best in the world.