(Australia, New Zealand) The work of a wool classer, sorting and assigning grades to wool according to its quality.

(sociology) A participant in class warfare.

plural of class warrior

(regular expressions) Characters which are excluded in a pattern.

(aviation, travel) (in a reservation system) The letter used to signify a particular fare level.

(martial arts) A division of competition used to match competitors against others of their own weight

(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.

(algebra) A subset of a group which is an equivalence class in the quotient set of the group divided by conjugation as equivalence relation.

(mathematics, topology, geometry) Any of a group of characteristic classes associated with complex vector bundles, with applications in physics, string theory, etc.