This is the 936th most frequent Norwegian word.
uken
"Uken" means "the week" in English.
Here, 'uken' means 'the week' and is used to refer to the current week in progress with the definite article 'Den' attaching to 'uk' as 'uken'.
Denne uken har jeg mange oppgaver å fullføre.
This week, I have many tasks to complete.
In this case, 'uken' serves as the definite form of 'uke' (week), preceded by a time-reference phrase.
Jeg gleder meg til uken når vi skal på tur.
I am looking forward to the week when we are going on a trip.
'Uken' here reflects the thematic week within general statements, again in its definite form.