wave theory

noun
1.
Also called undulatory theory. Physics. the theory that light is transmitted as a wave, similar to oscillations in magnetic and electric fields. Compare corpuscular theory.
2.
Historical Linguistics. a theory that accounts for shared features among languages or dialects by identifying these features as innovations that spread from their points of origin to the speech of contiguous areas.


Origin:
1825–35

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
wave theory
 
n
1.  the theory proposed by Huygens that light is transmitted by waves
2.  See electromagnetic wave any theory that light or other radiation is transmitted as waves

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
It led to the development of the wave theory of light and the electromagnetic
  spectrum, and it underlies quantum mechanics.
And this wave theory is not what is happening so stop searching doom websites
  to predict a coming disaster.
The instrument of its revival was the wave theory of light.
Kinematic wave theory is used for routing flows over contributing overland-flow
  areas and through the channel network.
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