This is the 12469th most frequent Russian word.
классе
The Russian word "классе" means "class" (prepositional case, typically referring to being in or at a class or classroom).
Here, 'классе' is used to indicate a physical classroom as a location.
Мы будем изучать математику в классе.
We will study mathematics in the classroom.
In this sentence, 'классе' refers to a grade level in school.
В третьем классе дети изучают основы грамматики.
In the third grade, children learn the basics of grammar.
Again, 'классе' denotes the physical classroom as the place of action.