those people at the top of a social hierarchy / the aristocracy

(chiefly Britain) educated people with liberal opinions and attitudes

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

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

plural of character class

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

(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.

(software engineering) A type of static structure diagram that describes the structure of a system by showing the system's classes, their attributes, and the relationships between the classes.

(linguistics) A linguistic form class whose members are words.

(US, colloquial) An introductory university course that is designed to "weed out" those students who are not able to pass it.