Definition of reductio ad absurdum in English:

reductio ad absurdum

Syllabification: re·duc·ti·o ad ab·sur·dum
Pronunciation: /rəˈdəktēˌō ˌad əbˈsərdəm, -ˈdəkSHēˌō
 
/

noun

Philosophy
  • A method of proving the falsity of a premise by showing that its logical consequence is absurd or contradictory.
    More example sentences
    • Opposition to stem-cell research is the reductio ad absurdum of the right-to-life argument.
    • The argument that says no individual has power leads to a reductio ad absurdum.
    • For some reason, this strikes me as the reductio ad absurdum of the whole project.

Origin

Latin, literally 'reduction to the absurd'.

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