This is the 424th most frequent Czech word.
ročníku
"Ročníku" means "grade," "year," or "edition," depending on context.
Here, 'ročníku' is used to denote the academic year or grade level someone is in.
Tento student je v prvním ročníku na univerzitě.
This student is in the first year at the university.
In this context, 'ročníku' refers to a group of students belonging to a particular academic year.
Náš ročník vyprodukoval mnoho úspěšných absolventů.
Our class produced many successful graduates.
Here, 'ročníku' is used to mean an installment or iteration of an annual event.