This is the 893rd most frequent Danish word.
femte
"Femte" means "fifth" in English.
Here, 'femte' is used as an ordinal number indicating the sequence position of the book among others read by the subject this year.
Det er den femte bog, jeg læser i år.
This is the fifth book I am reading this year.
In this sentence, 'femte' specifies the ordinal position of the floor in the building.
Hun bor på femte etage i bygningen.
She lives on the fifth floor of the building.
Here, 'femte' refers to the ordinal sequence of the wedding anniversary in chronological order.