Look up tautology in Wiktionary, the free dictionary.

Tautology may refer to:

• Tautology (language), a redundant statement in literature and rhetoric
• Tautology (logic), in formal logic, a statement that is true in every possible interpretation
• Tautology (rule of inference), a rule of replacement for logical expressions

• Pleonasm
• Redundancy (disambiguation)
• Tautological (disambiguation)
• Tautonym, a scientific name of a species in which both parts of the name have the same spelling

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