Abbreviation of classify.

Abbreviation of classification.

(education) Occurring while a class or lesson is taking place.

present participle of class

(especially in combination) The condition of being a member of a (specified) class

(music) An interval measured by the distance between its two pitch classes ordered so they are as close as possible.

(music) An equivalence class of all pitches that are octaves apart, and which would be labeled by an integer, not a traditional letter name.

(US) All students who have graduated or will graduate from a school in a given year.

A planned event at which members of a past school class meet.

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.