Definition of reductio ad absurdum noun from the Oxford Advanced Learner's Dictionary

 

reductio ad absurdum

 noun
noun
BrE BrE//rɪˌdʌktiəʊ æd æbˈsɜːdəm//
 
; NAmE NAmE//rɪˌdʌktioʊ æd æbˈsɜːrdəm//
 
[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 Word OriginLatin, literally ‘reduction to the absurd’.
See the Oxford Advanced American Dictionary entry: reductio ad absurdum