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Definition of Fundamental constant
1. Noun. (physics) any of a set of physical quantities that play a fundamental role in basic theories ¹
2. Noun. (physics) A physical quantity that is not a function of other constants, such as ? (pi), C (light speed), etc. The smallest common denominators of physics, and the parameters or dimensions for the 'position' of our universe in the [ multiverse]. ¹
¹ Source: wiktionary.com