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  1. A unit of measurement is a definite magnitude of a quantity, defined and adopted by convention or by law, that is used as a standard for measurement of the same kind of quantity. [1] Any other quantity of that kind can be expressed as a multiple of the unit of measurement.

    en.wikipedia.org/wiki/Unit_of_measurement

    Units of measurement are generally defined on a scientific basis, overseen by governmental or independent agencies, and established in international treaties, pre-eminent of which is the General Conference on Weights and Measures (CGPM), established in 1875 by the Metre Convention, overseeing the International System of Units (SI).

    en.wikipedia.org/wiki/Measurement
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    2 days ago · SI, also known as the International System of Units, is a decimal system of weights and measures derived from and extending the metric system. It has seven base units for length, mass, time, electric current, luminous …

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  9. Defining the International System of Units (SI) | NIST

    Sep 29, 2023 · Learn the full forms and definitions of the seven base units of the International System of Units (SI), which are meter, kilogram, second, kelvin, candela, mole, and ampere. See historical and modern standards and …

  10. Metric system - Simple English Wikipedia, the free encyclopedia

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    Learn about the metric system, a decimal-based system of measurement that originated in France and became the International System of Units (SI). Explore the definitions, properties and examples of metric units and prefixes, and the …