English Dictionary

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tautology (tɔːˈtɒlədʒɪ



(plural) -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) 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 . Compare inconsistency (sense 3, contingency (sense 5

Derived Forms

tautological (ˌtɔːtəˈlɒdʒɪkəl , ˌtautoˈlogic, or tauˈtologous  adjective
ˌtautoˈlogically, or tauˈtologously  adverb

Word Origin

C16: from Late Latin tautologia, from Greek, from tautologos


View thesaurus entry
= repetition, redundancy, verbiage, iteration, verbosity, repetitiveness, prolixity, repetitiousness, pleonasm


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