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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. 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 …

  4. 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.

  5. Yasiin Bey - Wikipedia

    Yasiin Bey (/ jæˈsiːn ˈbeɪ / yass-EEN BAY; born December 11, 1973), formerly known as Mos Def (/ ˌmoʊs ˈdɛf / MOHSS DEF), is an American rapper, singer, and actor. A prominent figure in conscious …

  6. DEF | definition in the Cambridge English Dictionary

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

  7. Def - definition of def by The Free Dictionary

    Define def. def synonyms, def pronunciation, def translation, English dictionary definition of def. cool Abused, Confused, & Misused Words by Mary Embree Copyright ...

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

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

  9. DEF | English meaning - Cambridge Dictionary

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

  10. DEF Definition & Meaning | Dictionary.com

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