Definition of reductio ad absurdum noun from the Oxford Advanced American Dictionary

 

reductio ad absurdum

 noun
noun
NAmE//rɪˌdʌktioʊ æd əbˈsərdəm//
 
[uncountable, countable](philosophy)(from Latin)
 
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a method of proving that something is not true by showing that its result is not logical or sensible
See the Oxford Advanced Learner's Dictionary entry: reductio ad absurdum