from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Disproof of a proposition by showing that it leads to absurd or untenable conclusions.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The method of proving a statement by assuming the statement is false and, with that assumption, arriving at a blatant contradiction.
from The Century Dictionary and Cyclopedia
- n. A reduction to an absurdity; the proof of a proposition by proving tho falsity of its contradictory opposite: an indirect demonstration.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- 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
Medieval Latin reductiō ad absurdum : Latin reductiō, a bringing back, reduction + Latin ad, to + Latin absurdum, absurdity, from neuter of absurdus, absurd.(American Heritage® Dictionary of the English Language, Fourth Edition)