# Meter

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A Meter is a SI Base Unit that is used to measure length.

**AKA:**Metre, m.**Example(s)****Counter-Example(s):****See:**Metric System, Base Unit of Mesurement, International System of Units (SI), Imperial Units, US Customary Units, International Bureau of Weights And Measures, Units of Measurement, The Earth, Nanometer.

## References

### 2018

- (Wikipedia, 2018) ⇒ https://en.wikipedia.org/wiki/Metre Retrieved:2018-12-28.
- The
**metre**(British spelling and BIPM spelling^{[1]}) or**meter**(American spelling) (from the French unit*mètre*, from the Greek noun μέτρον, "measure") is the base unit of length in some metric systems, including the International System of Units (SI). The SI unit symbol is**m**"^{[2]}. The metre is defined as the length of the path travelled by light in a vacuum in second .The metre was originally defined in 1793 as one ten-millionth of the distance from the equator to the North Pole – as a result the Earth's circumference is approximately 40,000 km today. In 1799, it was redefined in terms of a prototype metre bar (the actual bar used was changed in 1889). In 1960, the metre was redefined in terms of a certain number of wavelengths of a certain emission line of krypton-86. In 1983, the current definition was adopted.

The imperial inch is defined as 0.0254 metres (2.54 centimetres or 25.4 millimetres). One metre is about inches longer than a yard, i.e. about inches.

- The

- ↑ "17th General Conference on Weights and Measures (1983), Resolution 1". Retrieved 19 September 2012.
- ↑ "Base unit definitions: Meter". National Institute of Standards and Technology. Retrieved 28 September 2010.