This is the 707th most frequent Finnish word.
uuden
"Uuden" means "of the new" in English.
In this sentence, 'uuden' is the genitive form of 'uusi', modifying 'auton' to mean 'new car'.
Ostin uuden auton.
I bought a new car.
Here, 'uuden' modifies 'vuoden', indicating possession and conveying 'New Year's' in English.
Uuden vuoden juhlat olivat upeita.
The New Year's celebrations were wonderful.
'Uuden' here describes 'tilaisuuden', emphasizing its freshness and novelty.