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micro

“Micro” as a prefix denotes “one millionths”, making a micrometre a millionth of a metre.

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micro: "Micro" as a prefix denotes "one millionths", making a micrometre a millionth of a metre.
metre: In the international system of units (SI), the basic unit for length. Since 1983, the official definition uses the constancy of the speed of light as postulated in special relativity: the metre is defined with the help of the basic unit for time, the second: a metre is the distance that light travels in a vacuum in one 299792458th of a second.
metre (metre): In the international system of units (SI), the basic unit for length. Since 1983, the official definition uses the constancy of the speed of light as postulated in special relativity: the metre is defined with the help of the basic unit for time, the second: a metre is the distance that light travels in a vacuum in one 299792458th of a second.

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