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SI base units
The basic unit of length in the SI (with symbol "m"), equal to the length of the path travelled by light in a vacuum during a time interval of 1/299,792,458 of a second.
The base unit of length in the International System of Units (SI), conceived of as 1/10000000 of the distance from the North Pole to the Equator, and now defined as the distance light will travel in a vacuum in 1/299792458 second.
The basic unit of length in the International System of Units (SI: Système International d'Unités), equal to the distance travelled by light in a vacuum in 1/299 792 458 seconds. The metre is equal to 39+47⁄127 (approximately 39.37) imperial inches.