This is the 267th most frequent Croatian word.
četvrtak
"Četvrtak" means "Thursday" in English.
By saying 'na četvrtku,' the day is referenced in a locative sense, describing activities associated with it.
Na četvrtku se tradicionalno jede riba.
On Thursday, people traditionally eat fish.
Here, 'četvrtak' is used to refer to the specific day of the week.
Danas je četvrtak.
Today is Thursday.
'Četvrtak' is used to specify a day in the future for a planned event.