tautology

Noun
  1. (logic) a statement that is necessarily true (synset 107105577)
    "the statement `he is brave or he is not brave' is a tautology"
    referred to in: logic - the branch of philosophy that analyzes inference
    is a type of: true statement, truth - a true statement
  2. Useless repetition (synset 107105406)
    "to say that something is `adequate enough' is a tautology"
    is a type of: repetitiousness, repetitiveness - verboseness resulting from excessive repetitions

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