This is the 8743rd most frequent Polish word.
rocznika
"Rocznika" means "yearbook" or "annual issue" in English, depending on context.
The word 'rocznika' functions here as part of an expression indicating the production year of an object, in this case, a car.
Samochód mojego wujka jest rocznika 2005.
My uncle's car is from the year 2005.
Here, 'rocznika' is used to specify the vintage year of the wine being sought.
Mój przyjaciel szuka wina rocznika 2018.
My friend is looking for wine from the year 2018.
In this sentence, 'rocznika' refers to a cohort of individuals born or graduating in a particular year.