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reductio ad absurdum

Latin, literally "reduction to the absurd." Absurdum is neuter of absurdus. See reduction + absurd. The tactic is useful and unobjectionable in proofs in geometry.

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Definitions of reductio ad absurdum from WordNet

reductio ad absurdum (n.)
(reduction to the absurd) a disproof by showing that the consequences of the proposition are absurd; or a proof of a proposition by showing that its negation leads to a contradiction;
Synonyms: reductio
From wordnet.princeton.edu

Dictionary entries near reductio ad absurdum

redstart

red-streak

redtail

reduce

reducible

reductio ad absurdum

reduction

reductionism

reductionist

reductive

redundance