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fundamental constant

noun
1.
a physical constant, such as the gravitational constant or speed of light, that plays a fundamental role in physics and chemistry and usually has an accurately known value
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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Encyclopedia Article for fundamental constant

any of a set of fundamental invariant quantities observed in nature and appearing in the basic theoretical equations of physics. Accurate evaluation of these constants is essential in order to check the correctness of the theories and to allow useful applications to be made on the basis of those theories

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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