reductio ad absurdum


Concise Oxford English Dictionary © 2008 Oxford University Press:
reductio ad absurdum /rɪˌdʌktɪəʊ ad abˈsəːdəm/
noun Philosophy a method of proving the falsity of a premise by showing that its logical consequence is absurd or contradictory.
– origin L., lit. ‘reduction to the absurd’.
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