principle of equivalence

principle of equivalence

noun Physics.
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WordNet
principle of equivalence

noun
(physics) the principle that an observer has no way of distinguishing whether his laboratory is in a uniform gravitational field or is in an accelerated frame of reference 
WordNet® 3.0, © 2006 by Princeton University.
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00:10
Principle of equivalence is always a great word to know.
So is callithumpian. Does it mean:
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
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