The relationship between the meter and the millimeter is constant however. ![]() The definition of the meter has changed over time, the current definition being based on the distance traveled by the speed of light in a given amount of time. It indicates one thousandth of the base unit, in this case the meter. History/origin: The milli- prefix is one of many metric prefixes. It is defined in terms of the meter, as 1/1000 of a meter, or the distance traveled by light in 1/299 792 458 000 of a second. ![]() Definition: A millimeter (symbol: mm) is a unit of length in the International System of Units (SI).
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