Standard Lemma guide

tautology

noun · 6 senses · updated from the 2026-07-25 local source snapshot

Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.

Sound

Pronunciation

Each Play button uses your device's default local English voice, or a natural local fallback. The selected voice name appears after playback. This is synthesized speech, not a source recording.

  • Received-Pronunciation: /tɔˈtɒləd͡ʒi/
  • Australian, British, New-Zealand, Southern, Standard: /toːˈtɔləd͡ʒi/
  • Southern-England: Recorded audio is listed in the source snapshot.
  • /tɔˈtɑləd͡ʒi/ without the cot–caught merger
  • cot-caught-merger: /tɑˈtɑləd͡ʒi/
  • General-American: cot-caught Recorded audio is listed in the source snapshot.
  • Scotland: /tɔˈtɔləd͡ʒe/
  • rhymes with -ɒlədʒi

1

noun

Meaning 1

Redundant use of words, a pleonasm, an unnecessary and tedious repetition.

Definition source: English Wiktionary via Wiktextract

Usage: rhetoric, uncountable

Examples

  • It is tautology to say, "Forward Planning".

Meaning relationships

Synonyms: none provided

Antonyms: none provided

2

noun

Meaning 2

An expression that features tautology.

Definition source: English Wiktionary via Wiktextract

Usage: countable, rhetoric

Examples

  • The expression "raze to the ground" is a tautology, since the word "raze" includes the notion "to the ground".

Meaning relationships

Synonyms: none provided

Antonyms: none provided

3

noun

Meaning 3

A statement that is true for all truth values of its propositional variables.

Definition source: English Wiktionary via Wiktextract

Usage: countable

Qualifier: propositional logic

Topics: human-sciences, logic, mathematics, philosophy, sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

4

noun

Meaning 4

A statement that is true for all truth values of its Boolean atoms.

Definition source: English Wiktionary via Wiktextract

Usage: countable

Qualifier: first-order logic

Topics: human-sciences, logic, mathematics, philosophy, sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

5

noun

Meaning 5

useless repetition

Definition source: Princeton WordNet 3.0

Examples

  • to say that something is `adequate enough' is a tautology

Meaning relationships

Synonyms: none provided

Antonyms: none provided

Broader terms: repetitiveness, repetitiousness

6

noun

Meaning 6

(logic) a statement that is necessarily true

Definition source: Princeton WordNet 3.0

Examples

  • the statement `he is brave or he is not brave' is a tautology

Meaning relationships

Synonyms: none provided

Antonyms: none provided

Broader terms: truth, true statement

History

Etymology

From Late Latin tautologia, from Ancient Greek ταὐτολογία (tautología) from ταὐτός (tautós, “the same”) + λόγος (lógos, “explanation”). By surface analysis, tauto- + -logy.

Across languages

Translations

80 source translations are retained for this English entry.

  • Bulgarian: повторение (povtorenie) — uncountable: redundant use of words
  • Catalan: tautologia — uncountable: redundant use of words
  • Danish: tautologi — uncountable: redundant use of words
  • French: tautologie — uncountable: redundant use of words
  • Galician: tautoloxía — uncountable: redundant use of words
  • German: Pleonasmus — uncountable: redundant use of words
  • Greek: ταυτολογία (taftología) — uncountable: redundant use of words
  • Greek: πλεονασμός (pleonasmós) — uncountable: redundant use of words
  • Japanese: 同語反復 (dōgo hanpuku) — uncountable: redundant use of words
  • Japanese: トートロジー (tōtorojī) — uncountable: redundant use of words
  • Occitan: tautologia — uncountable: redundant use of words
  • Polish: pleonazm — uncountable: redundant use of words
  • Polish: tautologia — uncountable: redundant use of words
  • Polish: masło maślane — uncountable: redundant use of words
  • Portuguese: tautologia — uncountable: redundant use of words
  • Portuguese: pleonasmo — uncountable: redundant use of words
  • Portuguese: redundância — uncountable: redundant use of words
  • Romanian: tautologie — uncountable: redundant use of words
  • Romanian: pleonasm — uncountable: redundant use of words
  • Russian: тавтоло́гия (tavtológija) — uncountable: redundant use of words
  • Scottish Gaelic: ath-bhriathrachas — uncountable: redundant use of words
  • Serbo-Croatian: zalihost — uncountable: redundant use of words
  • Serbo-Croatian: redundancija — uncountable: redundant use of words
  • Spanish: tautología — uncountable: redundant use of words
  • Spanish: pleonasmo — uncountable: redundant use of words
  • Spanish: redundancia — uncountable: redundant use of words
  • Swedish: tautologi — uncountable: redundant use of words
  • Tagalog: pagpapaliguy-ligoy — uncountable: redundant use of words
  • Ukrainian: тавтоло́гія (tavtolóhija) — uncountable: redundant use of words
  • Chinese: 套套邏輯 /套套逻辑 — expression that features tautology
  • Chinese: 套套逻辑 (tàotàoluóji) — expression that features tautology
  • Chinese: 廢話 /废话 (fèihuà) — expression that features tautology
  • Chinese: 废话 (fèihuà) — expression that features tautology
  • Danish: tautologi — expression that features tautology
  • Dutch: tautologie — expression that features tautology
  • Finnish: tautologia — expression that features tautology
  • Finnish: toisto — expression that features tautology
  • French: tautologie — expression that features tautology
  • French: lapalissade — expression that features tautology
  • French: pléonasme — expression that features tautology
  • French: truisme — expression that features tautology
  • German: Tautologie — expression that features tautology
  • Greek: ταυτολογία (taftología) — expression that features tautology
  • Hungarian: tautológia — expression that features tautology
  • Italian: tautologia — expression that features tautology
  • Japanese: 同語反復 (dōgo hanpuku) — expression that features tautology
  • Japanese: トートロジー (tōtorojī) — expression that features tautology
  • Macedonian: тавтологија (tavtologija) — expression that features tautology
  • Portuguese: redundância — expression that features tautology
  • Portuguese: pleonasmo — expression that features tautology
  • Portuguese: tautologia — expression that features tautology
  • Romanian: tautologie — expression that features tautology
  • Romanian: pleonasm — expression that features tautology
  • Serbo-Croatian: tautologija — expression that features tautology
  • Spanish: redundancia — expression that features tautology
  • Spanish: pleonasmo — expression that features tautology
  • Spanish: tautología — expression that features tautology
  • Swedish: tautologi — expression that features tautology
  • Ukrainian: тавтоло́гія (tavtolóhija) — expression that features tautology
  • Catalan: tautologia — in logic
  • Czech: tautologie — in logic
  • Danish: tautologi — in logic
  • Dutch: tautologie — in logic
  • Finnish: tautologia — in logic
  • French: tautologie — in logic
  • German: Tautologie — in logic
  • Greek: ταυτολογία (taftología) — in logic
  • Hungarian: tautológia — in logic
  • Icelandic: sísanna — in logic
  • Italian: tautologia — in logic
  • Japanese: 恒真式 (kōshin shiki) — in logic
  • Japanese: トートロジー (tōtorojī) — in logic
  • Macedonian: тавтологија (tavtologija) — in logic
  • Polish: tautologia — in logic
  • Portuguese: tautologia — in logic
  • Serbo-Croatian: tautologija — in logic
  • Slovak: tautológia — in logic
  • Spanish: tautología — in logic
  • Swedish: tautologi — in logic
  • Ukrainian: тавтоло́гія (tavtolóhija) — in logic