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fundamental constant
fun·da·men·tal con·stant (plural fun·da·men·tal con·stants)


noun 
Definition:
 
very important physical constant: a physical constant, e.g. the speed of light or the charge carried by an electron, that is of profound importance in physical theories
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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