This is the 565th most frequent Polish word.
km
The Polish word "km" is an abbreviation for "kilometr," which means "kilometer" in English.
In this sentence, 'km' is used as an abbreviation for 'kilometers', a unit of distance.
Mam do przejechania 50 km do pracy.
I have 50 km to travel to work.
Here, 'km' again refers to 'kilometers', indicating the space between two points.
Dystans między miastami wynosi 120 km.
The distance between the cities is 120 km.
In this example, 'km' describes the length of the path covered in the context of running.