This is the 1077th most frequent Turkish word.
yüzyılı
"Yüzyılı" means "the century" in English.
In this sentence, 'yüzyıla' is in the dative case, indicating the time period to which something belongs.
Bu bina, 19. yüzyıla aittir.
This building belongs to the 19th century.
Here, 'yüzyıldır' uses the 'dır/dir' suffix to emphasize a statement of fact about the specified century.
Sanat tarihindeki önemli yüzyıllardan biri 17. yüzyıldır.
One of the important centuries in the history of art is the 17th century.
In this instance, 'yüzyılın' is in the genitive case, denoting possession or association to the 'next century'.