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  1. DEF Definition & Meaning - Merriam-Webster

    Feb 24, 2026 · 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. Diesel Exhaust Fluid (DEF) - AutoZone

    Looking for DEF fluid near me? We carry diesel exhaust fluid, also known as AdBlue, in jugs and bulk sizes with free delivery or in …

  4. Def - definition of def by The Free Dictionary

    Simmons' Def Jam has demonstrated a clear ability to maintain its leadership position as the premier rap label in the music business- …

  5. DEF Definition & Meaning | Dictionary.com

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

  6. DEF | English meaning - Cambridge Dictionary

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

  7. DEFINITION Definition & Meaning - Merriam-Webster

    Oct 29, 2026 · The meaning of DEFINITION is a statement of the meaning of a word or word group or a sign or symbol. How to use …

  8. BlueDEF® Diesel Exhaust Fluid - 2.5 Gallon at Menards®

    DEF is the primary ingredient used to help convert NOx to harmless nitrogen and water. BlueDEF® is stable, colorless, non …

  9. ICYMI: EPA’s New Guidance Removes Requirement for Diesel Exhaust …

    On Friday, March 27, 2026, President Trump announced U.S. EPA Administrator Lee Zeldin has issued new guidance making it …

  10. Diesel Exhaust Fluid: Everything You Need to Know

    Feb 10, 2025 · Learn everything you need to know about diesel exhaust fluid (DEF), how it works, and how to choose the best DEF …