This is the 8234th most frequent Polish word.
ostatnie
"Last" or "final."
The word 'ostatnie' is used here as an adjective meaning 'last' in the context of a sequence, modifying 'dni' (days).
Ostatnie dni lata były wyjątkowo ciepłe.
The last days of summer were exceptionally warm.
In this sentence, 'ostatnie' is used as an adjective to mean 'latest' or 'most recent', modifying 'wiadomości' (news).
Czy czytałeś ostatnie wiadomości z gazet?
Have you read the latest news from the papers?
Here, 'ostatnie' is used as an adjective meaning 'final' or 'last ever', expressing a definitive end, modifying 'wakacje' (holidays).