Usually means: Statement always true, logically redundant.
Definitions Related words Mentions History
We found 40 dictionaries that define the word tautology:

General (25 matching dictionaries)
  1. tautology: Longman Dictionary of Contemporary English
  2. tautology: Merriam-Webster
  3. tautology: Oxford Learner's Dictionaries
  4. tautology: American Heritage Dictionary of the English Language
  5. tautology: Collins English Dictionary
  6. tautology: Vocabulary.com
  7. Tautology, tautology: Wordnik
  8. tautology: Cambridge Advanced Learner's Dictionary
  9. tautology: Wiktionary
  10. tautology: Webster's New World College Dictionary, 4th Ed.
  11. tautology: The Wordsmyth English Dictionary-Thesaurus
  12. tautology: Infoplease Dictionary
  13. tautology: Dictionary.com
  14. tautology: Online Etymology Dictionary
  15. Tautology (disambiguation), Tautology (grammar), Tautology (language), Tautology (logic), Tautology (rhetoric), Tautology (rule of inference), Tautology: Wikipedia, the Free Encyclopedia
  16. Tautology: Online Plain Text English Dictionary
  17. tautology: Webster's Revised Unabridged, 1913 Edition
  18. tautology: Rhymezone
  19. Tautology: AllWords.com Multi-Lingual Dictionary
  20. tautology: Webster's 1828 Dictionary
  21. tautology: FreeDictionary.org
  22. tautology: Mnemonic Dictionary
  23. tautology: TheFreeDictionary.com

Art (6 matching dictionaries)
  1. tautology: ArtLex Lexicon of Visual Art Terminology
  2. Tautology (Taut.), tautology: Dictionary of Philosophical Terms and Names
  3. Tautology: Glossary of English Grammar Terms
  4. Glossary of Rhetorical Terms with Examples (No longer online)
  5. Tautology: Lexicon of Linguistics
  6. TAUTOLOGY: Bobs Byway OF POETIC TERMS

Business (1 matching dictionary)
  1. tautology: Legal dictionary

Computing (2 matching dictionaries)
  1. tautology: Free On-line Dictionary of Computing
  2. tautology: Encyclopedia

Medicine (1 matching dictionary)
  1. online medical dictionary (No longer online)

Miscellaneous (1 matching dictionary)
  1. tautology: Wordcraft Dictionary

Science (3 matching dictionaries)
  1. Tautology: Eric Weisstein's World of Mathematics
  2. tautology: PlanetMath Encyclopedia
  3. FOLDOP - Free On Line Dictionary Of Philosophy (No longer online)

Slang (1 matching dictionary)
  1. tautology: Urban Dictionary

(Note: See tautologies as well.)

Definitions from Wiktionary (
)
American English Definition British English Definition
noun:  (uncountable) Redundant use of words, a pleonasm, an unnecessary and tedious repetition.
noun:  (countable) An expression that features tautology.
noun:  (countable, logic, propositional logic) A statement that is true for all truth values of its propositional variables.
noun:  (countable, logic, first-order logic) A statement that is true for all truth values of its Boolean atoms.

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