This is the 5318th most frequent Turkish word.
katının
"Katının" means "of the floor" or "of the story" (as in a building).
Here, 'katının' refers to the possession related to the third floor ('kat'). It indicates the genitive case, translating to 'of the floor'.
Bu binanın üçüncü katının manzarası harika.
The view from the third floor of this building is wonderful.
In this sentence, 'katının' refers to the new floor of the school, showing possession linked to 'kat', which means floor, in the genitive case.
Okulun yeni katının açılışı gelecek hafta yapılacak.
The opening of the new floor of the school will take place next week.
'Katının' indicates the relationship between the top floor ('kat') and the house, showing possession and specifying which floor is being referred to.