Usually means: Overwhelming targeted servers with traffic.
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We found 14 dictionaries that define the word DDOS:

General (8 matching dictionaries)
  1. DDoS: Oxford Learner's Dictionaries
  2. DDoS: Collins English Dictionary
  3. DDos, ddos: Wordnik
  4. DDOS, DDOs, DDoS: Wiktionary
  5. DDOS: Dictionary.com
  6. DDOS, DDoS, DDos, Ddos: Wikipedia, the Free Encyclopedia
  7. ddos: Longman Dictionary of Contemporary English
  8. DDoS: Merriam-Webster

Art (1 matching dictionary)
  1. ddos: Cooking Dictionary

Computing (3 matching dictionaries)
  1. DDoS: Netlingo
  2. DDoS: Hacking Lexicon
  3. DDOS: Encyclopedia

Miscellaneous (2 matching dictionaries)
  1. DDOS: Acronym Finder
  2. AbbreviationZ (No longer online)

Definitions from Wiktionary (DDoS)

noun:  (Internet, computer security) A distributed denial-of-service attack, one that originates from many different (geographically and network topographically) sources, on a network of networks such as the Internet.
verb:  (Internet, computer security, transitive) To attack by DDOS.
noun:  (Internet, computer security) Alternative spelling of DDOS [(Internet, computer security) A distributed denial-of-service attack, one that originates from many different (geographically and network topographically) sources, on a network of networks such as the Internet.]
verb:  (Internet, computer security, transitive) Alternative spelling of DDOS [(Internet, computer security, transitive) To attack by DDOS.]

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