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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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  1. Units of length
  2. Units of measurement
  3. Quantity
  4. Mathematical concepts
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