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The word "Kilo" mean : 1ooo

Kilometre mean : 1000 metre

Definition about metre : The defenition about metre is Unit of lenght.

How the metre invented : The scientist invent the metre when they advocating and discussing a decimal system of measurement in France.

Metre useful for a unit for example, 100m................

Bibiliography:

1. www.dictionary.com

2.www.wikipedia.com