This is the 3453rd most frequent German word.
kilometern
"Kilometern" is the dative or plural form of "Kilometer," meaning "kilometers" (units of distance).
The word 'Kilometern' is used here as part of a measure of distance, in dative case, following the preposition 'von' implicitly implied in structures indicating distance.
Das Dorf ist fünf Kilometern entfernt.
The village is five kilometers away.
In this sentence, 'Kilometern' is in the dative plural form following the preposition 'durch', which typically governs the accusative but can indicate movement or distance.
Wir liefen gestern zwanzig Kilometern durch den Wald.
We walked twenty kilometers through the forest yesterday.
Here, 'Kilometern' is used in dative plural form to describe the extent of the journey, emphasizing the distance traveled and the experiences within.