This is the 1729th most frequent Japanese word.
キロ
"キロ" means "kilometer" or "kilogram," depending on context.
Here, キロ is used as an abbreviation for キロメートル, meaning 'kilometer', a unit of measurement for distance.
毎日10キロ走っています。
I run 10 kilometers every day.
In this case, キロ is short for キログラム, representing the unit 'kilogram', used to indicate weight.
この肉は2キロあります。
This meat weighs 2 kilograms.
Again, キロ signifies 'kilometer', indicating the distance traveled.