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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.
Terameter or teramatre is equal to 1E+12 (1012) meters (unit of length), comes from a combination of the metric prefix tera (T) and the SI unit of length meter (m). Plural name is terameters.