This is the 5971st most frequent Polish word.
ósmej
"Ósmej" means "eighth" or refers to the hour "eight" in the locative or genitive case in Polish.
Here, 'ósmej' is used as the locative case of the ordinal number 'ósma' (meaning 'eight') to indicate time.
Spotkamy się o ósmej.
We will meet at eight o'clock.
In this sentence, 'ósmej' modifies 'kondygnacji' in the locative case to describe the position of the apartment.
Jego mieszkanie znajduje się na ósmej kondygnacji.
His apartment is located on the eighth floor.
Here, 'ósmej' is used in the genitive case to denote association with 'klasy'.