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reductio ad absurdum
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noun
re·duc·tio ad ab·sur·dum
\ri-ˈdək-tē-ˌō-ˌad-əb-ˈsər-dəm, -ˈdək-sē-ō-, -shē-, -ˈzər-\
Definition of reductio ad absurdum
1 : disproof of a proposition by showing an absurdity to which it leads when carried to its logical conclusion
2 : the carrying of something to an absurd extreme
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Origin and Etymology of reductio ad absurdum
Late Latin, literally, reduction to the absurd
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Britannica.com: Encyclopedia article about reductio ad absurdum
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