Meaning of “class” - Learner’s Dictionary

class

noun uk us /klɑːs/
STUDENTS [ C ]

A1 a group of students who have lessons together:

Katie and Sarah are in the same class at school.
LESSON [ C, U ]

A1 a period of time in which students are taught something:

My first class starts at 8.30.
He was punished for talking in class (= during the lesson).
SOCIAL GROUP [ C, U ]

B2 one of the groups of people in a society with the same social and economic position, or the system of dividing people into these groups:

People are still very conscious of class in British society.
She's from a working-class background.
QUALITY [ C ]

A2 a group into which people or things are put according to their quality:

When it comes to mathematics, he's in a different class to his peers.
SIMILARITY [ C ]

a group of similar or related things, especially plants and animals

STYLE [ U ] informal

the quality of being stylish or fashionable:

a player with real class
→ See also middle class , upper class , working class

(Definition of “class noun” from the Cambridge Learner’s Dictionary © Cambridge University Press)