Differences between American and British English: class
In both the U.S. and the U.K., a class is usually a group of students who are learning together: Jill and I were in the same class in fifth grade. In the U.S., you can also use class to mean a group of students who all finished high school or college in a particular year: ♦ Tim was in the class of 1998. In the U.S., class is also used to mean a course of instruction in a particular subject: ♦ a class in business administration. The usual British word for this is course: ♦ a course in business administration. Class can also mean one of the periods in the school day when a group of students are taught: ♦ What time is your next class? British speakers usually use lesson in this meaning, but American speakers do not.