tautology

• 指逻辑上必然为真的陈述，也指用不同词语不必要地重复同一意思的表达。

A noun referring to a statement that is necessarily true by logical form, or the unnecessary repetition of an idea or phrase using different words.

1. Logical truthC1formal

   A statement that is always true by its logical form, regardless of the truth of its components.

   逻辑真理

   • In logic, 'A or not A' is a classic tautology.
   • The statement 'either it is raining or it is not raining' is a tautology.
   • Mathematicians often use tautologies to prove other theorems.

   反义词contradictionfallacy

2. Useless repetitionB2formal

   The unnecessary and often redundant repetition of an idea, statement, or word.

   同义反复

   • Saying 'free gift' is a common tautology.
   • The phrase 'past history' is a tautology because history is always about the past.
   • His speech was full of tautologies, like 'new innovation' and 'added bonus'.

   同义词pleonasmredundancyreiterationrepetitionwordiness