In measurement, any of numerous lineal measures (commonly 9.8–13.4 in. [25–34 cm]) based on the length of the human foot. It is used exclusively in English-speaking countries. In most countries and in all scientific applications, the foot (with its multiples and subdivisions) has been superseded by the metre. In the U.S. the definition of the foot as exactly 30.48 cm took effect in 1959. See also inch; International System of Units; yard.

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