Definition of "def" in English

noun

1. Abbreviation of definition.

2. Abbreviation of deficit.

adverb

1. (slang) Clipping of definitely.

   • i can def sneak out tn. where should i meet u?
   • And focus on cleaning the park. But we should def get waffle fries after.

adjective

1. (African-American Vernacular, slang) Excellent; very good.