# Meter

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**Metre** (or ** meter**), symbol

**m**, is the base unit of length in the International System of Units (SI). Originally intended to be one ten-millionth of the distance from the Earth's equator to the

**North Pole**, its definition of has been periodically refined to reflect growing knowledge of

**metrology**. Since 1983, it is defined as the distance travelled by light in a complete vacuum in

**1⁄299,792,458**of a

**second**.

## [edit] Also see

## [edit] Reference

- Wikipedia
*Meter*[1]

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