This is the 3994th most frequent Dutch word.
één
The Dutch word "één" means "one" (the numeral).
In this context, 'één' is used to emphasize the distinctiveness or importance of one item among others.
Dat is er één om te onthouden.
That's one to remember.
Here, 'één' indicates one item from a group, making a specific selection among several options.
Één van deze boeken is speciaal voor jou.
One of these books is especially for you.
Here, 'één' is used to specify the quantity of something being exactly one.