Usually means: Mysterious force accelerating universe's expansion.
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We found 9 dictionaries that define the word dark energy:

General (7 matching dictionaries)
  1. dark energy: Merriam-Webster
  2. dark energy: Oxford Learner's Dictionaries
  3. dark energy: Wiktionary
  4. dark energy: Dictionary.com
  5. Dark Energy (album), Dark Energy, Dark energy: Wikipedia, the Free Encyclopedia
  6. dark energy: TheFreeDictionary.com
  7. dark energy: Longman Dictionary of Contemporary English

Computing (1 matching dictionary)
  1. dark energy: Encyclopedia

Science (1 matching dictionary)
  1. Dark Energy: Extragalactic Astronomy

Definitions from Wiktionary (dark energy)

noun:  (astronomy, astrophysics) A hypothetical form of energy which, it is supposed, is spread uniformly throughout space (and time) and has anti-gravitational properties: it represents a possible mechanism for the cosmological constant, and thus is one of the possible explanations for the current accelerating rate of expansion of the universe; and it is estimated to account for about 74% of the mass-energy of the universe.

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