class, kind (group, collection, category or set sharing characteristics or attributes) / class; elegance / class (a group of students) / class; lesson / classroom / class

part of speech (the function a word or phrase performs)

upper class

middle class (a social and economic class lying above the working class and below the upper class)

working class (social class doing physical work)

working class (social class doing physical work)

(algebra) coset (a copy of a subgroup multiplied by some element from the parent group)

first class (the most luxurious class of accommodation)

classmate (someone who is or was in the same class)

plural of colega de classe