The metre
or meter(symbol: m) is the
fundamental unit of
length in the
International System of Units (SI). The metre was originally defined by a prototype object meant to represent the distance between the
poles and the
Equator. Today, it is defined as of a
light-second.Because it is the base unit of length in the SI, all SI units which involve length (such as
area or
speed) are defined relative to the metre. Additionally, due to the metre being the only SI base unit used to measure a vector (e.g. displacement), all vector units are defined relative to the metre. However, decimal multiples and submultiples of the metre— such as
kilometre (1000 metres) and
centimetre (0.01 metres)— can be formed by adding
SI prefixes to metre (see the table below).
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