The prefix kilo- means 1000.
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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.
The prefix for 1000 in the International System on Units is milli. For example, one milligram is one-one thousandth of a gram.
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The prefix that is used to express 1000 times is milli. That is why you will find units like milligrams, millimetres and so on.
"A thousand of..." eg 1 kilometre is 1000 metres.