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  1. Diesel Exhaust Fluid (DEF) | San Antonio, TX - Bear Oil

    What is DEF (Diesel Exhaust Fluid)? DEF looks like water and has a slight ammonia scent. DEF is never added directly to diesel fuel. It is sprayed into the exhaust and breaks down harmful …

  2. DEF Definition & Meaning - Merriam-Webster

    What does the abbreviation DEF stand for? Meaning: defendant; defense. How to use def in a sentence.

  3. def noun - Definition, pictures, pronunciation and usage notes

    Definition of def noun in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

  4. def - Wiktionary, the free dictionary

    Nov 17, 2025 · 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 […]

  5. DEF definition and meaning | Collins English Dictionary

    8 meanings: slang very good, esp of hip-hop definition → 1. a formal and concise statement of the meaning of a word, phrase,.... Click for more definitions.

  6. Cambridge Dictionary: Find Definitions, Meanings & Translations

    The most popular dictionary and thesaurus for learners of English. Definitions and meanings of words with pronunciations and translations.

  7. Def - definition of def by The Free Dictionary

    def Also found in: Thesaurus, Medical, Legal, Financial, Acronyms, Idioms, Encyclopedia, Wikipedia.

  8. DEF Definition & Meaning | Dictionary.com

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

  9. DEF | definition in the Cambridge English Dictionary

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

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

    3 days ago · Learn the meaning. The world's leading online dictionary: English definitions, synonyms, word origins, example sentences, word games, and more. A trusted authority for …