Usually means: Remote Access Tool for computers.
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We found 50 dictionaries that define the word RAT:

General (31 matching dictionaries)
  1. rat: Longman Dictionary of Contemporary English
  2. rat: Merriam-Webster
  3. rat: Oxford Learner's Dictionaries
  4. rat: American Heritage Dictionary of the English Language
  5. rat: Collins English Dictionary
  6. rat: Vocabulary.com
  7. Rat, rat, rat: Wordnik
  8. rat: Cambridge Advanced Learner's Dictionary
  9. RAT, Rat, 'rat, rat: Wiktionary
  10. rat: Webster's New World College Dictionary, 4th Ed.
  11. rat: The Wordsmyth English Dictionary-Thesaurus
  12. rat: Infoplease Dictionary
  13. RAT: Dictionary.com
  14. rat: Online Etymology Dictionary
  15. rat: Cambridge Essential American English Dictionary
  16. RAT, Rat (disambiguation), Rat (film), Rat (newspaper), Rat (short story), Rat (zodiac), Rat, The Rat (Beavis and Butt-Head), The Rat (novel), The Rat (play), The Rat (song), The Rat: Wikipedia, the Free Encyclopedia
  17. Rat: Online Plain Text English Dictionary
  18. rat: Webster's Revised Unabridged, 1913 Edition
  19. rat: Rhymezone
  20. Rat (m), rat, rat (de), rat (m): AllWords.com Multi-Lingual Dictionary
  21. rat: Webster's 1828 Dictionary
  22. RAT: Dictionary of Americanisms (1848)
  23. RAT: Stammtisch Beau Fleuve Acronyms
  24. Rat, Rat, Rat: Dictionary of Phrase and Fable (1898)
  25. rat: FreeDictionary.org
  26. rat: Mnemonic Dictionary
  27. rat: TheFreeDictionary.com
  28. rat: Wikimedia Commons US English Pronunciations
  29. rat(e): AllWords.com Multi-Lingual Dictionary

Business (1 matching dictionary)
  1. Glossary of Trade and Shipping Terms (No longer online)

Computing (5 matching dictionaries)
  1. RAT: Netlingo
  2. Webopedia (No longer online)
  3. RAT: Hacking Lexicon
  4. SMS Dictionary (No longer online)
  5. rat: Encyclopedia

Medicine (3 matching dictionaries)
  1. rat: Merriam-Webster Medical Dictionary
  2. online medical dictionary (No longer online)
  3. rat: Medical dictionary

Miscellaneous (5 matching dictionaries)
  1. rat, rat, rat: Terminology and Descriptions of Geneaological Words
  2. RAT: Acronym Finder
  3. RAT: Three Letter Words with definitions
  4. AbbreviationZ (No longer online)
  5. rat: Idioms

Slang (5 matching dictionaries)
  1. rat, rat, rat, rat, rat: Green’s Dictionary of Slang
  2. Totally Unofficial Rap (No longer online)
  3. rat: ESL Slang page
  4. R.A.T, The Rat: Urban Dictionary
  5. Rat: Twists, Slugs and Roscoes: Hardboiled Slang

(Note: See rating as well.)

Definitions from Wiktionary (RAT)

noun:  (zoology) A medium-sized rodent belonging to the genus Rattus.
noun:  (informal) Any of the numerous members of several rodent families (e.g. voles and mice) that resemble true rats in appearance, usually having a pointy snout, a long, bare tail, and body length greater than about 12 cm, or 5 inches.
noun:  (informal) A person who is known for betrayal; a scoundrel; a quisling.
noun:  (informal) An informant or snitch.
noun:  (informal) A scab: a worker who acts against trade union policies.
noun:  (slang) A person who routinely spends time at a particular location.
noun:  A wad of shed hair used as part of a hairstyle.
noun:  A roll of material used to puff out the hair, which is turned over it.
noun:  (UK, north-west London, slang, vulgar) Vagina, vulva.
verb:  (of a dog, etc.) To hunt or kill rats.
verb:  (intransitive) To betray a political party, cause or principle; to betray someone, to desert a person or thing.
verb:  (informal, intransitive) To work as a scab, going against trade union policies.
verb:  (chiefly US) To backcomb (hair).
verb:  (intransitive, with on or out) To inform on someone; to betray someone to the police or authorities.
noun:  (regional) A scratch or a score.
noun:  (nautical, regional) A place in the sea with rapid currents and crags where a ship is likely to be torn apart in stormy weather.
verb:  (regional) To scratch or score.
verb:  (regional, rare, obsolete) To tear, rip, rend.
verb:  Damn, drat, blast; used in oaths.
noun:  (military, slang) A ration.
noun:  The first of the 12-year cycle of animals which appear in the Chinese zodiac related to the Chinese calendar.
noun:  (chiefly informal) Short for muskrat. [A large semiaquatic rodent of species Ondatra zibethicus.]
noun:  (medicine, countable) Initialism of rapid antigen test. [(medicine) A fast-acting chromatographic immunoassay for the detection of specific antigens.]
noun:  (public transportation, countable) Initialism of Rapid Area Transit.
noun:  (aviation, countable) Initialism of ram air turbine. [(aviation) A small wind turbine mounted on an aircraft and used to generate electrical or hydraulic power from the force of air moving past the aircraft.]
noun:  (computing, countable) Initialism of remote-access Trojan.
noun:  (philosophy, uncountable) Initialism of relevant alternatives theory.

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