This is the 256th most frequent Czech word.
kilometrů
"Kilometrů" means "kilometers" in English (genitive plural form).
The word 'kilometrů' is in the genitive plural form, indicating the quantity of distance walked.
Po turistické stezce jsme ušli 12 kilometrů.
We walked 12 kilometers along the hiking trail.
The word 'kilometrů' here is used in the genitive plural form, denoting a measurement of distance.
Praha je vzdálená 200 kilometrů od Brna.
Prague is 200 kilometers away from Brno.
Here, 'kilometrů' is again used in the genitive plural to describe the length of the journey.