theory of relativity

theory of relativity

noun Physics.
relativity (def. 2).

Origin:
1960–65
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Theory of relativity is always a great word to know.
So is acoustics. Does it mean:
a form of electromagnetic radiation of shorter wavelength than light and capable of penetrating solids and of ionizing gases
the branch of physics that deals with sound and sound waves
WordNet
theory of relativity

noun
(physics) the theory that space and time are relative concepts rather than absolute concepts [syn: relativity
WordNet® 3.0, © 2006 by Princeton University.
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