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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.
海裡是指定義為1852米(約6,076.1英尺或1.1508英里)的度量單位。 歷史上,它被定義為緯度的一分鐘,相當於緯度的六十分之一。