This is the 5347th most frequent Polish word.
sobotnie
"Saturday" or "Saturday-related."
Here, 'sobotnie' is used as an adjective describing 'spacery' (walks), indicating that these walks take place on Saturdays.
Uwielbiam sobotnie spacery po parku.
I love Saturday walks in the park.
In this sentence, 'sobotnie' modifies 'popołudnia' (afternoons), specifying the time of the week.
Sobotnie popołudnia spędzamy wspólnie jako rodzina.
Saturday afternoons are spent together as a family.
Here, 'sobotnie' is used to describe 'śniadanie' (breakfast), denoting that it is associated with Saturday.