This is the 4677th most frequent Polish word.
najnowszy
"Newest" or "latest."
Here, 'najnowszy' is used as an adjective describing 'model telefonu', indicating the most recent or new model.
To jest najnowszy model telefonu.
This is the latest model of the phone.
In this sentence, 'najnowszy' modifies 'film' to refer to the film that has been released most recently.
Czy widziałeś najnowszy film w kinach?
Have you seen the newest movie in theaters?
The word 'najnowszy' is used here to qualify 'raport', denoting the most current or up-to-date report.