This is the 12443rd most frequent Russian word.
километра
"Kilometer" in the genitive singular or accusative plural form.
The word 'километров' is used in the plural genitive form to denote distance covered.
Мы прошли пять километров за час.
We walked five kilometers in an hour.
The word 'километров' is used in the plural genitive form indicating a quantity of distance remaining.
До города осталось несколько километров.
There are a few kilometers left to the city.
The word 'километра' is used in the singular genitive form after the numeral 'два' to denote the magnitude of the distance.