This is the 187th most frequent Dutch word.
zondag
Sunday.
The word 'zondag' is used here as a noun representing the specific day, the first day of the week according to some traditions.
Zondag is de eerste dag van de week.
Sunday is the first day of the week.
The word 'zondag' is used here as a temporal marker to indicate the specific day on which the action will take place.
Ik ga mijn vrienden ontmoeten op zondag.
I am going to meet my friends on Sunday.
The word 'zondag' is used here in a general, recurring sense to signify the habitual activity that takes place each week on this day.