Kilo-

For other uses, see Kilo.
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Kilo is a unit prefix in the metric system of measurement, denoting multiplication by one thousand (103). The International System of Units reserves the lowercase symbol k.

Kilo is derived from the Greek word χίλιοι (chilioi), meaning "thousand".

In 19th century English the prefix was sometimes spelled chilio, in line with a puristic opinion by Thomas Young. As an opponent of suggestions to introduce the metric system in Britain, he qualified the nomenclature adopted in France as barbarous.

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