fundamental interaction

World English Dictionary
fundamental interaction
 
n
any of the four basic interactions that occur in nature: the gravitational, electromagnetic, strong, and weak interactions

Collins English Dictionary - Complete & Unabridged 10th Edition
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WordNet
fundamental interaction

noun
(physics) the transfer of energy between elementary particles or between an elementary particle and a field or between fields; mediated by gauge bosons [syn: interaction
WordNet® 3.0, © 2006 by Princeton University.
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