This is the 65th most frequent Czech word.
rok
The Czech word "rok" means "year" in English.
The word "rok" is used here to signify the current year, often in the sense of a calendar year.
Tento rok byl velmi úspěšný.
This year has been very successful.
The word "rok" in its plural form "roky" is used to reference a span of years in the past.
Narodil jsem se před třiceti roky.
I was born thirty years ago.
Here, "roku" is used as a genitive singular to indicate time duration within a specific context.