n.
In measurement , any of numerous lineal measures (commonly 9.813.4 in. [2534 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 In most countries and in all scientific applications, the foot (with its multiples and subdivisions) has been superseded by the metre .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 .