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  1. DEF Definition & Meaning - Merriam-Webster

    The meaning of DEF is definitely. How to use def in a sentence.

  2. def - Wiktionary, the free dictionary

    Feb 28, 2026 · Failing to see the word's antecedents, I suspected that def was either bogus or an orphan, lost to its slang ancestors through mispronunciation or misspelling […]

  3. DEF Definition & Meaning | Dictionary.com

    DEF definition: definitely. See examples of def used in a sentence.

  4. DEFINITION Definition & Meaning - Merriam-Webster

    The meaning of DEFINITION is a statement of the meaning of a word or word group or a sign or symbol. How to use definition in a sentence.

  5. What Is DEF and How Does It Work? - MotorTrend

    Jul 29, 2024 · Diesel exhaust fluid, or DEF, is a key component in lowering pollutants emitted from diesel engines, helping to improve efficiency and reduce emissions.

  6. DEF | English meaning - Cambridge Dictionary

    DEF definition: 1. very good: 2. very good: . Learn more.

  7. DEFINITION Definition & Meaning | Dictionary.com

    DEFINITION definition: the act of defining, or of making something definite, distinct, or clear. See examples of definition used in a sentence.

  8. Meanings & Definitions of English Words | Dictionary.com

    2 days ago · With the Oscars approaching, it's time to find out what the movie title Bugonia is all about. This word is just one example of how early science and myth shaped English vocabulary. It's not just …

  9. Diesel exhaust fluid - Wikipedia

    Diesel exhaust fluid (DEF; also known as AUS 32 and sometimes marketed as AdBlue[3]) is a liquid used to reduce the amount of air pollution created by a diesel engine. Specifically, DEF is an …

  10. What Exactly Is DEF & What Does The Acronym Stand For?

    Apr 19, 2025 · The letters DEF stand for diesel exhaust fluid. Sometimes, you'll hear people refer to it as DEF fluid, and all three formats are acceptable. If you're interested in learning more about DEF,...