Usually means: Boundary beyond which nothing escapes.
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We found 22 dictionaries that define the word event horizon:

General (12 matching dictionaries)
  1. event horizon: Merriam-Webster.com
  2. event horizon: Oxford Learner's Dictionaries
  3. event horizon: The Word Spy
  4. event horizon: American Heritage Dictionary of the English Language
  5. event horizon: Collins English Dictionary
  6. event horizon: Wordnik
  7. event horizon: Wiktionary
  8. event horizon: Infoplease Dictionary
  9. event horizon: Dictionary.com
  10. Event Horizon (album), Event Horizon (film), Event Horizon (movie), Event Horizon (sculpture), Event Horizon, Event horizon (disambiguation), Event horizon: Wikipedia, the Free Encyclopedia
  11. event horizon: Free Dictionary
  12. event horizon: Dictionary/thesaurus

Business (1 matching dictionary)
  1. BuzzWhack (No longer online)

Computing (2 matching dictionaries)
  1. event horizon: Netlingo
  2. event horizon: Encyclopedia

Science (4 matching dictionaries)
  1. Event Horizon: Eric Weisstein's World of Physics
  2. Imagine the Universe! Dictionary (No longer online)
  3. Event Horizon: Extragalactic Astronomy
  4. EVENT HORIZON: Zoom Astronomy Glossary

Slang (1 matching dictionary)
  1. Event-Horizon, The Event Horizon, event horizon: Urban Dictionary

Tech (2 matching dictionaries)
  1. High-Energy Astrophysics (No longer online)
  2. JPL Terms (No longer online)

Definitions from Wiktionary (event horizon)

noun:  (astrophysics) The gravitational sphere of a black hole within which the escape velocity is greater than the speed of light.
noun:  (astrophysics) The furthest distance in the past of the universe from which light signals from an event can reach an observer at later times.
noun:  (by extension) A point of no return.

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