미터법에 의한 길이의 단위로, 1,000미터에 해당함.
A metric unit of length equal to 1,000 meters, approximately equivalent to 0.6214 miles.
예문:
"The marathon course is exactly 42.195 kilometers long."
"The nearest gas station is about five kilometers from here."
"Light travels at a speed of nearly 300,000 kilometers per second."