mètre wikipedia - EAS
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The metre (Commonwealth spelling) or meter (American spelling; see spelling differences) (from the French unit mètre, 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 currently defined as the length of
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See moreMetre is the standard spelling of the metric unit for length in nearly all English-speaking nations except the United States and the Philippines, which use meter. Other West Germanic languages, such as German and Dutch, and
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See morePendulum or meridian
In 1671 Jean Picard measured the length of a "seconds pendulum" and proposed a unit of measurement twice that length to be called the universal toise...
See moreSI prefixes can be used to denote decimal multiples and submultiples of the metre, as shown in the table below. Long distances are usually expressed in km, astronomical units (149.6 Gm), light-years (10 Pm), or parsecs (31 Pm), rather than in Mm, Gm, Tm, Pm, Em, Zm
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See more• Conversion of units for comparisons with other units
• International System of Units
• Introduction to the metric system...
See moreThe etymological roots of metre can be traced to the Greek verb μετρέω (metreo) (to measure, count or compare) and noun μέτρον (metron) (a measure), which were used for physical measurement, for poetic metre and by extension for moderation or avoiding extremism (as in
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See moreIn France, the metre was adopted as an exclusive measure in 1801 under the Consulate. This continued under the First French Empire until
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See moreWithin this table, "inch" and "yard" mean "international inch" and "international yard" respectively, though approximate conversions in the left column hold for both international and survey units.
"≈" means "is approximately equal to"; "≡" means "equal by...
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