What is Class ?
Class is (noun) 1. a group of children or adults who go to school or college together There are 30 children in my son’s class. 2. a group of people who were at the same school or college at the same time in the past She’s organising a reunion for the class of ’76. 3. a lesson 4. people of the same group in society People from different social classes mixed at the reception. 5. a certain level of quality Always buy the best class of product. These peaches are Class 1. 6. the quality of seats or service on a plane or train first class the best quality and most expensive option If you travel first class on the train to France, you get free drinks.
source: Easier English, Student Dictionary Upper Intermediate Level