AskDefine | Define tautology

Dictionary Definition



1 (logic) a statement that is necessarily true; "the statement `he is brave or he is not brave' is a tautology"
2 useless repetition; "to say that something is `adequate enough' is a tautology"

User Contributed Dictionary



  1. In the context of "linguistics|uncountable": redundant use of words
    It is tautology to say, "Forward Planning".
  2. In the context of "linguistics|countable": An expression that features tautology.
  3. In the context of "logic|countable": A statement that is true for all values of its variables
    Given a Boolean A, "A OR (NOT A)" is a tautology.


uncountable: redundant use of words
  • Croatian: zalihost, redundancija
expression that features tautology
  • Chinese: 套套邏輯, 套套逻辑 (tào tào luó ji); 廢話, 废话 (fèi huà)
  • Croatian: tautologija
  • Dutch: tautologie
  • Finnish: tautologia, toisto
  • French: tautologie
  • German: Tautologie
  • Hungarian: tautológia
  • Italian: tautologia
  • Spanish: redundancia, pleonasmo
in logic
  • Croatian: tautologija
  • Dutch: tautologie
  • Finnish: tautologia
  • French: tautologie
  • German: Tautologie
  • Hungarian: tautológia
  • Spanish: tautología

External links

pedia tautology

Extensive Definition

Tautology can refer to:
tautology in Bulgarian: Тавтология
tautology in German: Tautologie
tautology in Ido: Tautologio
tautology in Japanese: トートロジー
tautology in Hebrew: טאוטולוגיה
tautology in Georgian: ტავტოლოგია
tautology in Macedonian: Тавтологија
tautology in Dutch: Tautologie
tautology in Russian: Тавтология
tautology in Serbian: Таутологија
tautology in Finnish: Tautologia
tautology in Swedish: Tautologi

Synonyms, Antonyms and Related Words

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