Definition of oxymoron noun from the Oxford Advanced Learner's Dictionary

 

oxymoron

 noun
noun
BrE BrE//ˌɒksɪˈmɔːrɒn//
 
; NAmE NAmE//ˌɑːksɪˈmɔːrɑːn//
 
(specialist) Linguistic devices
 
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a phrase that combines two words that seem to be the opposite of each other, for example a deafening silence See related entries: Linguistic devices Word Origin mid 17th cent.: from Greek oxumōron, neuter (used as a noun) of oxumōros ‘pointedly foolish’, from oxus ‘sharp’ + mōros ‘foolish’.
See the Oxford Advanced American Dictionary entry: oxymoron