Definitions

1. noun

A unit of distance or length, equivalent to 1,000 meters, used to measure the distance of a journey, the length of a road, or the distance between two points.

“The marathon runner finished the 42 km course in under three hours.”

2. abbreviation

An abbreviation for kilometer, used in informal contexts to denote a unit of distance or length.

“The bus route is approximately 5 km from the city center.”