Mach\'s principle

noun Physics.

the proposition that there is no absolute space and that the inertia and acceleration of a body are determined by all of the matter of the universe.

Origin:
after E. Mach

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Mach's principle is always a great word to know.

So is magic number. Does it mean:

the property of a fluid that resists the force tending to cause the fluid to flow; the measure of the extent to which a fluid possesses this property

the atomic number or neutron number of an exceptionally stable nuclide

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