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|Look up tautology in Wiktionary, the free dictionary.|
Tautology may refer to:
- Tautology (rhetoric), a self-reinforcing pretense of significant truth
- Tautology (grammar), the use of redundant words
- Tautology (logic), a universal truth in formal logic
- Tautology (rule of inference), a rule of replacement for logical expressions
- Tautonym, a species name composed of a repeated word, or one identical to the genus name
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