
Also known as avoirdupois system, avdp
thumb|upright=1.2|Finely crafted pan balance or scales with boxed set of standardized gram weights sequenced in units of mass.Avoirdupois (; abbreviated avdp.) is a measurement system of weights that uses pounds and ounces as units. It was first commonly used in the 13th century AD and was updated in 1959.
thumb|upright=1.2|Finely crafted pan balance or scales with boxed set of standardized gram weights sequenced in units of mass.Avoirdupois (; abbreviated avdp.) is a measurement system of weights that uses pounds and ounces as units. It was first commonly used in the 13th century AD and was updated in 1959.
In 1959, by international agreement among countries that used the pound as a unit of mass, the International Avoirdupois Pound was fixed at the modern definition of exactly kilograms.. It remains the everyday system of weights used in the United States, and is still used, in varying degrees, in everyday life in the United Kingdom, Canada and some other former British colonies, despite their official adoption of the metric system.
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