from the GNU version of the Collaborative International Dictionary of English
- adj. a mode of demonstration in which proof is given by showing that any other supposition involves an absurdity (reductio ad absurdum), or an impossibility; thus, one quantity may be proved equal to another by showing that it can be neither greater nor less.
- n. (called also reductio ad absurdum), in which the correct conclusion is an inference from the demonstration that any other hypothesis must be incorrect.
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