This is the 588th most frequent Polish word.
tydzień
The Polish word "tydzień" means "week" in English.
The word 'tydzień' is used here in the instrumental case as part of a prepositional phrase to denote time.
W przyszłym tygodniu odwiedzę swoją rodzinę.
Next week, I will visit my family.
Here, 'tydzień' is in the nominative case as the subject of the sentence.
Ten tydzień był bardzo pracowity.
This week was very busy.
In this sentence, 'tydzień' is part of the phrase 'każdy tydzień' where it remains in the nominative form and indicates a general unit of time.