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noun, plural -gies.
1.
needless repetition of an idea, especially in words other than those of the immediate context, without imparting additional force or clearness, as in “widow woman.”
2.
an instance of such repetition.
3.
Logic.
a.
a compound propositional form all of whose instances are true, as “A or not A.”
b.
an instance of such a form, as “This candidate will win or will not win.”
Related forms
tau·to·log·i·cal·ly, tau·tol·o·gous·ly, adverb
tau·tol·o·gist, noun
non·tau·to·log·i·cal, adjective
non·tau·to·log·i·cal·ly, adverb
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Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Tautology
is a GRE word you need to know.
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Collins
World English Dictionary
| tautology (tɔːˈtɒlədʒɪ) | |
| —n , pl -gies | |
| 1. | the use of words that merely repeat elements of the meaning already conveyed, as in the sentence Will these supplies be adequate enough? in place of Will these supplies be adequate? |
| 2. | logic inconsistency Compare contingency a statement that is always true, esp a truth-functional expression that takes the value true for all combinations of values of its components, as in either the sun is out or the sun is not out |
| [C16: from Late Latin tautologia, from Greek, from tautologos] | |
| tautological | |
| —adj | |
| tauto'logic | |
| —adj | |
| tau'tologous | |
| —adj | |
| tauto'logically | |
| —adv | |
| tau'tologously | |
| —adv | |
Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History
tautology
1579, from L.L. tautologia "representation of the same thing" (c.350), from Gk. tautologia, from tautologos "repeating what has been said," from tauto "the same" + -logos "saying," related to legein "to say" (see lecture).
Online Etymology Dictionary, © 2010 Douglas Harper
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FOLDOC
Computing Dictionary
tautology definition
logicA proposition which is always true.
Compare: paradox.
The Linguistic Smarandache Tautologies, (http://gallup.unm.edu/~smarandache/tautolog.txt).
(1999-07-28)
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