fundamental constant
noun
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(physics) any of a set of physical quantities that play a fundamental role in basic theories
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(physics) A physical quantity that is not a function of other constants, such as Π (pi), C (light speed), etc. The smallest common denominators of physics, and the parameters or dimensions for the 'position' of our universe in the [http://www.youtube.com/watch?v=mze5kwdH0R0&NR=1%20 multiverse].