noun \t-ˈtä-lə-jē\

: a statement in which you repeat a word, idea, etc., in a way that is not necessary

plural tau·tol·o·gies

Full Definition of TAUTOLOGY

a :  needless repetition of an idea, statement, or word
b :  an instance of tautology
:  a tautologous statement

Examples of TAUTOLOGY

  1. A beginner who has just started is a tautology.


Late Latin tautologia, from Greek, from tautologos
First Known Use: 1574

Other Philosophy Terms

dialectic, dualism, epistemology, existentialism, metaphysics, ontology, sequitur, solipsism, transcendentalism


noun    (Concise Encyclopedia)

In logic, a statement that cannot be denied without inconsistency. Thus, “All bachelors are either male or not male” is held to assert, with regard to anything whatsoever that is a bachelor, that it is male or it is not male. In the propositional calculus, even complicated symbolic expressions such as [(A B) (C ¬ B)] (C ¬ A) can be shown to be tautologies by displaying in a truth table every possible combination of T (true) and F (false) of its arguments A, B, C. A tautology can be purely formal (a statement form rather than a statement), and in some usages only such formal truths are tautologies.


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