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  1. DEF Definition & Meaning - Merriam-Webster

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

  2. 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 …

  3. DEF Definition & Meaning | Dictionary.com

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

  4. Diesel Exhaust Fluid - Shop DEF Fluid - AutoZone

    Reduce emissions and keep your diesel vehicle running clean with diesel exhaust fluid (DEF) from AutoZone. We sell the best …

  5. Merriam-Webster: America's Most Trusted Dictionary

    Merriam-Webster's Dictionary - America's Most Trusted Dictionary, with articles, reviews, word suggestions, and more.

  6. 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 …

  7. What does -> mean in Python function definitions? - Stack Overflow

    Jan 17, 2013 · It's a function annotation. In more detail, Python 2.x has docstrings, which allow you to attach a metadata string to …

  8. 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 …

  9. Everything To Know About DEF With The GM Duramax 3.0L LZ0

    Jan 11, 2026 · DEF is injected into the exhaust stream to reduce emissions by converting nitrogen oxide into nitrogen and water …

  10. 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 …