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Definition of dark matter noun from the Oxford Advanced Learner's Dictionary

dark matter

noun
 
/ˌdɑːk ˈmætə(r)/
 
/ˌdɑːrk ˈmætər/
[uncountable] (astronomy)
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  1. according to some theories, material that exists in space but does not reflect any lightTopics Spacec2, Physics and chemistryc2
See dark matter in the Oxford Advanced American DictionarySee dark matter in the Oxford Learner's Dictionary of Academic English
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