Usually means: Angry, mentally disturbed, wildly enthusiastic.
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We found 56 dictionaries that define the word mad:

General (28 matching dictionaries)
  1. MAD, mad: Merriam-Webster.com
  2. MAD, mad: Oxford Learner's Dictionaries
  3. MAD, mad: American Heritage Dictionary of the English Language
  4. mad: Collins English Dictionary
  5. mad: Vocabulary.com
  6. Mad, mad, mad: Wordnik
  7. -mad, mad: Cambridge Advanced Learner's Dictionary
  8. mad: Wiktionary
  9. mad: Webster's New World College Dictionary, 4th Ed.
  10. mad: The Wordsmyth English Dictionary-Thesaurus
  11. mad: Infoplease Dictionary
  12. MAD, Mad: Dictionary.com
  13. mad: Online Etymology Dictionary
  14. mad: Cambridge Essential American English Dictionary
  15. M.A.D, M.A.D. (Indian TV programme), M.A.D. (Veronica Mars), M.A.D (band), MAD (TV series), MAD (Video), MAD (programming language), MAD, Mad (Got7 EP), Mad (Ne-Yo song), Mad (Raven EP), Mad (TV series), Mad (band), Mad (magazine), Mad (professional wrestling), Mad (song), Mad, The Mad: Wikipedia, the Free Encyclopedia
  16. Mad: Online Plain Text English Dictionary
  17. mad: Webster's Revised Unabridged, 1913 Edition
  18. mad: Rhymezone
  19. mad: AllWords.com Multi-Lingual Dictionary
  20. mad: Webster's 1828 Dictionary
  21. MAD: Dictionary of Americanisms (1848)
  22. MAD, mad: Stammtisch Beau Fleuve Acronyms
  23. mad: Free Dictionary
  24. mad: Mnemonic Dictionary
  25. MAD: Dictionary/thesaurus
  26. mad: Wikimedia Commons US English Pronunciations

Art (2 matching dictionaries)
  1. Glossary of Stamp Collecting Terms (No longer online)
  2. Ma&;D: Cooking Dictionary

Business (7 matching dictionaries)
  1. MoneyGlossary.com (No longer online)
  2. INVESTORWORDS (No longer online)
  3. MAD: bizterms.net
  4. MAD: Bloomberg Financial Glossary
  5. MAD: Investopedia
  6. mad: Legal dictionary
  7. MAD: Financial dictionary

Computing (3 matching dictionaries)
  1. MAD: Free On-line Dictionary of Computing
  2. MAD: CCI Computer
  3. MAD (programming language), MAD: Encyclopedia

Medicine (3 matching dictionaries)
  1. online medical dictionary (No longer online)
  2. MAD: Prostate Cancer Interactive Glossary
  3. MAD: Medical dictionary

Miscellaneous (5 matching dictionaries)
  1. MAD: Acronym Finder
  2. mad: Magic or Madness
  3. MAD: Three Letter Words with definitions
  4. AbbreviationZ (No longer online)
  5. mad: Idioms

Science (1 matching dictionary)
  1. mad: LITTLE EXPLORERS(TM) Picture Dictionary

Slang (4 matching dictionaries)
  1. mad, mad, mad, mad: Green’s Dictionary of Slang
  2. Totally Unofficial Rap (No longer online)
  3. Mad: Dublin Slang and Phrasebook
  4. M.A.D: Urban Dictionary

Sports (1 matching dictionary)
  1. MAD: Dog Fanciers Acronym List

Tech (2 matching dictionaries)
  1. MAD: GEOGRAPHIC INFORMATION SYSTEMS, CARTOGRAPHY, AND REMOTE SENSING
  2. DOD Dictionary of Military Terms: Joint Acronyms and Abbreviations (No longer online)

(Note: See madded as well.)

Definitions from Wiktionary (
)
American English Definition British English Definition
adjective:  (chiefly British Isles) Insane; crazy, mentally deranged.
adjective:  (chiefly US; informal in UK and Ireland) Angry, annoyed.
adjective:  (chiefly in the negative, informal) Used litotically to indicate satisfaction or approval.
adjective:  (UK, Ireland, informal) Bizarre; incredible.
adjective:  Wildly confused or excited.
adjective:  Extremely foolish or unwise; irrational; imprudent.
adjective:  (colloquial, usually with for or about) Extremely enthusiastic about; crazy about; infatuated with; overcome with desire for.
adjective:  (of animals) Abnormally ferocious or furious; or, rabid, affected with rabies.
adjective:  (slang, chiefly New York, African-American Vernacular) Intensifier, signifying abundance or high quality of a thing; very, much or many.
adjective:  (of a compass needle) Having impaired polarity.
adverb:  (slang, chiefly New York, African-American Vernacular, UK and Ireland, dialectal) Intensifier; to a large degree; extremely; exceedingly; very; unbelievably.
verb:  (obsolete, intransitive) To be or become mad.
verb:  (now colloquial US, Jamaica) To madden, to anger, to frustrate.
noun:  Initialism of mutual assured destruction or mutually assured destruction.
noun:  Initialism of magnetic anomaly detector.
noun:  (genetics) Initialism of mothers against decapentaplegic.
noun:  (astrophysics) Acronym of magnetically-arrested disc (a type of black hole accretion disc).
noun:  (medicine, ENT, dental, prosthetics) Initialism of mandibular advancement device.
noun:  (programming) Acronym of Michigan algorithm decoder, a programming language, a variant of ALGOL, developed in 1959 at the University of Michigan.
noun:  (genetics) Acronym of mothers against decapentaplegic.

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