This is the 4997th most frequent Polish word.
poniedzia艂ek
"Poniedziałek" means "Monday" in English.
Here, 'poniedziałków' is a plural, genitive form of 'poniedziałek', used to express the general concept of Mondays.
Nie lubię poniedziałków, bo wtedy zaczyna się praca.
I don't like Mondays because work starts then.
Here, 'poniedziałek' is used as a subject in the sentence, referring to the day Monday as an entity.
Poniedziałek jest pierwszym dniem tygodnia.
Monday is the first day of the week.
Here, 'poniedziałek' is used in the prepositional form 'w poniedziałek', indicating a specific day on which the action occurs.