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Noun: tautology  to'tó-lu-jee
  1. (logic) a statement that is necessarily true
    "the statement 'he is brave or he is not brave' is a tautology"
     
  2. Useless repetition
    "to say that something is 'adequate enough' is a tautology"

Derived forms: tautologies

Type of: repetitiousness, repetitiveness, true statement, truth

Encyclopedia: Tautology