This is the 6585th most frequent Dutch word.
vijftig
Fifty.
Used to indicate a specific quantity (50 items).
Ik heb vijftig boeken in mijn verzameling.
I have fifty books in my collection.
Used to specify an amount of money (50 euros).
Het kost vijftig euro om deze kaart te kopen.
It costs fifty euros to buy this ticket.
Used humorously to imply an invalid or non-existing time, as there is no 'quarter to fifty.'