Last Updated：2025/11/19

(uncountable) Redundant use of words, a pleonasm, an unnecessary and tedious repetition. / (countable) An expression that features tautology.

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tautology

Source Word

tautology

IPA(Pronunciation)

uncountable countable

(uncountable) Redundant use of words, a pleonasm, an unnecessary and tedious repetition. / (countable) An expression that features tautology.

Japanese Meaning

同語反復（不要な重複表現）、冗長な表現 / 冗語、余計な言葉の繰り返し

The editor deleted several lines because the passage suffered from tautology and added no new information.

編集者は、その箇所が冗長表現で新しい情報を伝えていないとして数行を削除した。

Sense（1）

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

It is tautology to say, "Forward Planning".

Sense（2）

(countable) An expression that features tautology.

Sense（3）

(countable, logic, propositional logic) A statement that is true for all truth values of its propositional variables.

Sense（4）

(countable, logic, first-order logic) A statement that is true for all truth values of its Boolean atoms.

tautologies

（ plural ）