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Si

   Also found in: Dictionary/thesaurus, Medical, Financial, Acronyms, Wikipedia, Hutchinson 0.06 sec.

Si, chemical symbol

Si, symbol for the element silicon silicon, nonmetallic chemical element; symbol Si; at. no. 14; at. wt. 28.0855; m.p. 1,410°C;; b.p. 2,355°C;; sp. gr. 2.33 at 25°C;; valence usually +4. Silicon is the element directly below carbon and above germanium in Group 14 of the periodic table .
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SI, abbreviation for the International System of Units

SI: see International System of Units International System of Units, officially called the Système International d'Unités, or SI, system of units adopted by the 11th General Conference on Weights and Measures (1960). It is based on the metric system .
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Si, river, China

Si, river, China: see Xi Xi (shē) or Xi Jiang
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See systems integrator, SI units and silicon.

1.(unit)SI - Système International.
2.(character)SI - Shift In.
3.(networking)si - The country code for Slovenia.
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