class, type, group / "Une classe de conscrits" refers to all the recruits conscripted in a particular year, similar to the idea of a cohort. In the plural, "classes" refers to a period of military training / class

field trip

economy class (the least expensive class of accommodation on an airplane)

working class (social class doing physical work)

first class (the most luxurious and expensive class of accommodation on a train, airplane, etc.)

second class (the second-most (least, if there are only two) luxurious and expensive class of accommodation on a train, airplane, etc.)

(linguistics) noun class

(object-oriented programming) subclass

inflection of sous-classer:
/ inflection of sous-classer:

middle class