This is the 12321st most frequent Russian word.
кабинета
"Кабинета" (genitive singular form of "кабинет") translates to "of the office" or "of the study."
In this sentence, 'кабинет' refers to an office or a room used by the principal.
Студент зашёл в кабинет директора.
The student entered the principal's office.
Here, 'кабинет' is used to denote a home study or a dedicated room for work.
Мебель для кабинета выбирал специалист по интерьеру.
A specialist in interior design chose the furniture for the study.
In this context, 'кабинет' is used to refer to a classroom, specifically the biology classroom.