Definition of class:

part of speech: verb

To arrange; to put into sets or ranks; to distribute into groups.

part of speech: noun

A rank of persons; a number of persons in society supposed to have the same position in regard to means, rank, & c.; a number of students in a college, or pupils in a school, engaged in the same course of study; a distribution into groups of creatures or things having something in common; a kind or sort.