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The metre (international spelling) or meter (American spelling) (from the Greek noun μέτρον, "measure") is the base unit of length in the International System of Units (SI). The SI unit symbol is m. The metre is defined as the length of the path travelled by light in a vacuum in 1/299 792 458 seconds.
Kilometer or kilometre is one of the most common metric units of length or distance. It is equal to 1 000 meters. It is about 0.62137119 mile, 1093.6133 yards, or 3280.8399 feet. Plural name is kilometers.