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  1. Diesel exhaust fluid - Wikipedia

    Passenger car using an AdBlue pump 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 …

  2. DEF Definition & Meaning - Merriam-Webster

    Feb 24, 2026 · The meaning of DEF is definitely. How to use def in a sentence.

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

    1 day ago · The world's leading online dictionary: English definitions, synonyms, word origins, example sentences, word games, and more. A trusted authority for 25+ years!

  4. Dutch language - Wikipedia

    A young woman speaking Dutch (1:32) Dutch (Endonym: Nederlands [ˈneːdərlɑnts] ⓘ, Nederlandse taal) is a West Germanic language of the Indo-European language family, spoken by about 25 million …

  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 - Wiktionary, the free dictionary

    Jun 14, 2026 · Russell Simmons, a founder of the company [Def Jam Recordings], said that his partner, in designing the logo for the company’s record label, may have been the first to set def down in …

  7. DEF Definition & Meaning | Dictionary.com

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

  8. DEF | English meaning - Cambridge Dictionary

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

  9. 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 brands, including AutoZone, Lumax, and Peak Blue DEF fluid.

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

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