Word.ws English Dictionary

def

/dɛf/

def is the abbreviation of definition.

def is the abbreviation of deficit.

def is the clipping of definitely.

Meaning of definition

Noun

definition (countable and uncountable, plural definitions)

  1. A statement of the meaning of a word, word group, sign, or symbol; especially, a dictionary definition.
    • Your definition of "elephant" needs to be more precise than "a big animal with large ears".
  2. (usually) A clear instance conforming to the dictionary or textbook definition.
    • Baroque is a good game, but only for a very narrow subset of the gaming audience. It is the very definition of a niche title.2008 May, Shoeless Wayne Santos, “Baroque” (game review), GameAxis Unwired, Hardware Zone Pte, page 51
  3. A statement expressing the essential nature of something; formulation.
  4. The action or process of defining.
  5. The act of defining; determination of the limits.
  6. A product of defining.

See all 14 meanings of definition

Meaning of deficit

Noun

deficit (plural deficits)

  1. Deficiency in amount or quality; a falling short; lack.
    • The crop output this year has been comparatively small, owing to the deficit in rainfall.
  2. A situation wherein, or amount whereby, spending exceeds (e.g. government) revenue.
    • Dr. Beeching's obvious intent is that if Scottish—and similarly unprofitable English and Welsh—railways are to be maintained, it must be done by an unconcealed subsidy; he is determined that the railways shall no longer be preoccupied with—and derided for—immense deficits which include the burden...1962 October, “Talking of Trains: Passed to you, Mr. Macmillan”, in Modern Railways, page 220

Adjective

def (comparative deffer, superlative deffest)

  1. (slang, African-American Vernacular) Excellent; very good.
    • You real def. I’m gonna put you on stage.1985, Ralph Farquhar, Krush Groove, spoken by Run (Joseph Simmons)
    • See I do this thing, so come pursue this king / One minor rhyme is all you just bring / Cause I’m the best I’m def, ask the rest they left1988, “Run’s House”, in Tougher Than Leather, performed by Run-DMC

Noun capitalized: DEF

DEF (countable and uncountable, plural DEFs)

  1. (abbreviation) Abbreviation of diesel exhaust fluid.
  2. (abbreviation, initialism, roleplaying games) Initialism of defence point.
  3. (abbreviation, initialism) Initialism of daily electronic feed.
  4. (abbreviation, initialism) Initialism of delayed electronic feed.

Synonyms of def

30 more synonymsFewer synonyms

Forms of def

Noun
pluraldefs
pluralDEFs
Adjective
comparativedeffer
superlativedeffest

Origin of def

Clipping of definitive or definitely; alternatively an eye spelling of death referring to an absolute.

Words formed from def

Words that rhyme with def

15 more rhymesFewer rhymes

Questions about def

What does def mean?
Def means excellent; very good.
What is def the abbreviation of?
Def is the abbreviation of definition.
What part of speech is def?
Def can be an adjective or a noun.
How do you pronounce def?
Def is pronounced /dɛf/.

Words near def in the dictionary

  1. deeya
  2. deeyas
  3. deez
  4. deez nuts
  5. deez nutz
  6. def
  7. def'n
  8. def'ns
  9. def.
  10. deface
  11. defaceable

Source and license

Adapted from Wiktionary: def (page history and authors); DEF (page history and authors); definition (page history and authors); deficit (page history and authors). Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws reformatted the entry and added links. Wiktionary data of 2026-09-02.

Last updated:

Pronunciation audio from Wikimedia Commons, each file under its own free license: En-au-def.ogg.

Cite this entry: “def.” Word.ws, https://word.ws/def. Based on Wiktionary, CC BY-SA 4.0.