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Mille is Latin for thousand. Annus is latin for year. Milleannus <-> Millenium, thus you have the translation equivalent to one thousand years. Kilo is Greek for thousand. The metric system uses Greek words for the first three increases in magnitude (deca, hecto, kilo), and Latin words for the first three decreases in magnitude (deci, centi, milli). Deci is the only word that legitimately means what we use it to describe - tenth; centi is hundred, while milli is thousand. Source: wikipedia

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Q: If the prefix milli means one thousandth why is 1000 years called a millennium instead of a kilonium?
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