Definition of 1 meter
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The metre is currently defined as the length of the path travelled by light in a vacuum in 1299 792 458 of a second. ... The metre was originally defined in 1793 as one ten-millionth of the distance from the equator to the North Pole along a great circle, so the Earth's circumference is approximately 40000 km.
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Metre (m), also spelled meter, in measurement, fundamental unit of length in the metric system and in the International Systems of Units (SI). It is equal to approximately 39.37 inches in the British Imperial and United States Customary systems.
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