1. using different words to say the same thing; unnecessarily repetitive
2. relating to or involving tautology in logic
Usage: logic; formal

Examples

• The phrase ‘free gift’ is tautological since all gifts are free.
• His tautological explanation added no new information.
• The statement ‘it is what it is’ is purely tautological.
• Her writing was criticized for being tautological and wordy.
• The professor explained that tautological statements are always true in logic.
• Saying ‘PIN number’ is tautological because PIN already means personal identification number.