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Inch, unit of measure |
| An inch (plural: inches; symbol or abbreviation: in) is the name of a unit of length in a number of different systems, including English units, Imperial units, and United States customary units. Its size can vary from system to system. There are 36 inches in a yard and 12 inches in a foot. A corresponding unit of area is the square inch and a corresponding unit of volume is the cubic inch. The inch is the virtually universal unit of measurement in the United States, and is very commonly used in Canada and the United Kingdom. In the US and the UK, personal heights are expressed in feet and inches by people of all ages. In 1958 the United States and countries of the Commonwealth of Nations defined the length of the international yard to be precisely 0.9144 metres. Consequently, the international inch is defined to be equal to 25.4 millimetres. The English word inch comes from Latin uncia meaning "one twelfth part" (in this case, one twelfth of a foot); the word ounce (one twelfth of a troy pound) has the same origin. |
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meter, exameter, petameter, terameter, gigameter, megameter, kilometer, hectometer, dekameter, decimeter, centimeter, millimeter, micrometer, micron, nanometer, picometer, femtometer, attometer, megaparsec, kiloparsec, parsec, light year, astronomical unit, league, nautical league (UK), nautical league (international), league (statute), mile, nautical mile (UK), nautical mile (international), mile (statute), mile (US survey), mile (Roman), kiloyard, furlong, furlong (US survey), chain, chain (US survey), rope, rod, rod (US survey), perch, pole, fathom, fathom (US survey), ell, yard, foot, foot (US survey), link, link (US survey), cubit (UK), hand, span (cloth), finger (cloth), nail (cloth), inch (US survey), barleycorn, mil, microinch, angstrom, a.u. of length, X-unit, fermi, arpent, pica, point, twip, aln, famn, caliber, centiinch, ken, Russian archin, Roman actus, vara de tarea, vara conuquera, vara castellana, cubit (Greek), long reed, reed, long cubit, handbreadth, fingerbreadth, Planck length, Electron radius (classical), Bohr radius, Earth's equatorial radius, Earth's polar radius, Earth's distance from sun, Sun's radius
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