And if you don't believe me, perhaps you might believe the...

And if you don't believe me, perhaps you might believe the oxford: (check the etymology of the word)

class
• noun 1 a set or category of things having a common characteristic and differentiated from others by kind or quality. 2 a system that divides members of a society into sets based on social or economic status. 3 a set in a society ordered by social or economic status. 4 a group of students or pupils who are taught together. 5 a lesson. 6 Biology a principal taxonomic category that ranks above order and below phylum or division. 7 informal impressive stylishness. 8 Brit. a division of candidates according to merit in a university examination.

• verb assign to a particular category.

• adjective informal showing stylish excellence: a class player.

— ORIGIN Latin classis ‘a division of the Roman people, a grade, or a class of pupils’.