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Definition of fundamental particle noun from the Oxford Advanced Learner's Dictionary

fundamental particle

noun
 
/ˌfʌndəmentl ˈpɑːtɪkl/
 
/ˌfʌndəmentl ˈpɑːrtɪkl/
(also elementary particle)
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  1. a very small piece of matter (= a substance), such as a quark, that does not contain within it any even smaller pieces of matter compare subatomic particleTopics Physics and chemistryc2

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