This is the 802nd most frequent Estonian word.
klassi
The Estonian word "klassi" means "class" (e.g., a group in school or a category).
The word 'klassi' is used in the context of a location, in this case, the classroom.
Ma läksin täna hommikul klassi.
I went to the classroom this morning.
Here, 'klassi' refers to a specific type or category of class, an art class.
Eelmisel aastal käisin ma kunstiklassi tundides.
Last year, I attended art class lessons.
In this sentence, 'klassi' denotes a group or level of students.