The megametre (International spelling as used by the International Bureau of Weights and Measures; SI symbol: Mm) or megameter (American spelling) is a unit of length in the metric system, equal to one million metres, the SI base unit of length, hence to 1,000 km or approximately 621.37 miles. Megametres (from the Greek words megas = big and metro...
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http://en.wikipedia.org/wiki/Megametre
• (n.) In the metric system, one million meters, or one thousand kilometers.
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http://thinkexist.com/dictionary/meaning/megametre/
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