Meaning of Tautology

What is Tautology:

As a tautology, it is called a rhetorical figure that consists of the repetition of the same idea unnecessarily. Also, in logic, it refers to a well-formed formula that is true from any interpretation.

The word tautology, as such, comes from the Greek ταυτολογία (tautology), which in turn is formed with the voices ταὐτό (tautó), which means "the same", and -λογία (-logy), which we can translate as "action to say"; in short, "act of saying the same thing."

Synonyms of tautology are redundancy, pleonasm, repetition, reiteration.

Tautology in rhetoric

In rhetoric, tautology is a literary figure in which the same thought or idea is expressed in different ways, but without adding information or value to the statement.

Thus, then, tautology is a repetition or reiteration of a meaning, previously provided, but with different words.

In this sense, tautology is considered a rhetorical or style vice, because it consists of an unnecessary or obvious repetition. However, it can also be used, such as pleonasm, for emphatic purposes.

Examples of tautology:

  • You are a human person.
  • He drenched himself in the wet water.
  • You have to live life.
  • I have many future projects.
  • He appeared with an unexpected surprise.
  • There was a full house in the stadium.
  • It is an unforgettable memory.

See more about Pleonasmo.

Tautology in logic

According to logic, a tautology is a formula that admits any interpretation because it is correctly formed. This means that every proposition is always valid, regardless of the values ​​assigned to it. To check the validity of a tautology, a truth table is created.

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