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Metre

 Home Mathematics Mathematical concepts Quantity Units of measurement Units of length
 0 By others on same topic  0 Discussions  1970-01-01  See my version
A metre (or meter) is the base unit of length in the International System of Units (SI). It is defined as the distance that light travels in a vacuum in 1/299,792,458 seconds. This definition has been in place since 1983, and it reflects a fundamental constant of nature, making it a highly precise standard for measurement.

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