The metric system uses the prefix kilo~ for a thousand.... kilometre = 1,000 metres.
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When the metric system was created, the inventors used the Greek word for 1000, kilo, as the prefix meaning 1000. They used the Latin word for 1000, mill, as the prefix meaning 1/1000.
"A thousand of..." eg 1 kilometre is 1000 metres.
The prefix kilo- means 1000.
There are 1000 grams in a kilogram. Kilo is a prefix meaning thousand.
There are 1000 meters in 1 kilometer - the prefix kilo meaning one thousand.