This is the 13596th most frequent Polish word.
pi膮tek
"Piątek" means "Friday" in English.
In this sentence, 'piątek' refers to a day of the week, Friday. It's used as a noun to specify the day.
Dziś jest piątek, cieszę się, że nadchodzi weekend.
Today is Friday, I'm glad the weekend is approaching.
Here, 'piątek' refers to a type of Polish traditional filling made with cottage cheese or similar. It is used as a noun.
Kupiłem bułkę z piątkiem, była bardzo smaczna.
I bought a bread roll with piątek, it was very tasty.
In this example, 'piątek' is again used to indicate the day Friday, emphasizing the concreteness of the time-related context.