This is the 989th most frequent Polish word.
wolne
"Free" or "time off."
Here, "wolne" is used as a noun to indicate a day off or free time.
Czy masz dzisiaj wolne od pracy?
Do you have a day off from work today?
Here, "wolnego czasu" is used in a genitive form (due to "trochę") to mean 'free time' as an adjective describing "czas."
Mam nadzieję, że znajdę trochę wolnego czasu na odpoczynek.
I hope to find some free time to rest.
Here, "wolne" is used as an adjective to describe "miejsce" (seat, place) meaning 'available' or 'unoccupied'.