(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.

plural of weeder class

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

plural of Chern class

plural of word class

Alternative form of subclass

plural of sub-class

plural of trousered class