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Metric System: The metric system is an internationally agreed decimal system of measurement created in France in 1799. The International System of Units (SI), the official system of measurement in almost every country in the world, is based upon the metric system.
Updated February 03, 2017. The metric system is a system of units of measurement established from its beginnings in 1874 by diplomatic treaty to the more modern General Conference on Weights and Measures - CGPM (ConferÃ©rence GÃ©nÃ©rale des Poids et Measures). The modern system is actually called the International System of Units or SI.