Definition of strong force noun from the Oxford Advanced Learner's Dictionary

 

strong force

 noun
noun
BrE
 
; NAmE
 
(physics) Energy and physical forces
 
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one of the four fundamental forces in the universe, which holds the parts of the nucleus of an atom together see also electromagnetism, gravity, weak force See related entries: Energy and physical forces
See the Oxford Advanced American Dictionary entry: strong force