Categories:UCUM base units,
Use British English from September 2012,
Wikipedia articles incorporating a citation from the 1911 Encyclopaedia Britannica with Wikisource reference,
Wikipedia articles incorporating text from the 1911 Encyclopædia Britannica
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.