Usually means: Sudden, significant change at atomic level.
Definitions Related words Mentions
We found 22 dictionaries that define the word quantum leap:

General (17 matching dictionaries)
  1. quantum leap: Longman Dictionary of Contemporary English
  2. quantum leap: Merriam-Webster
  3. quantum leap: Oxford Learner's Dictionaries
  4. quantum leap: American Heritage Dictionary of the English Language
  5. quantum leap: Collins English Dictionary
  6. quantum leap: Vocabulary.com
  7. quantum leap: Cambridge Advanced Learner's Dictionary
  8. quantum leap: Wiktionary
  9. quantum leap: Dictionary.com
  10. Quantum Leap (Album), Quantum Leap (TV Series), Quantum Leap (TV series), Quantum Leap (season Quantum+Leap+++(season+++1)), Quantum Leap (season 2), Quantum Leap (season 3), Quantum Leap (season 4), Quantum Leap (season 5), Quantum Leap, Quantum leap, The Quantum Leap: Wikipedia, the Free Encyclopedia
  11. quantum leap: Rhymezone
  12. quantum leap: AllWords.com Multi-Lingual Dictionary
  13. quantum leap: FreeDictionary.org
  14. quantum leap: Mnemonic Dictionary
  15. quantum leap: TheFreeDictionary.com

Computing (3 matching dictionaries)
  1. quantum leap: Netlingo
  2. Quantum Leap: CCI Computer
  3. quantum leap: Encyclopedia

Science (1 matching dictionary)
  1. Quantum Leap: Extragalactic Astronomy

Slang (1 matching dictionary)
  1. Quantum Leap: Urban Dictionary

(Note: See quantum_leaps as well.)

Definitions from Wiktionary (quantum leap)

noun:  (quantum mechanics) The discontinuous change of the state of an electron in an atom or molecule from one energy level to another.
noun:  (figurative) An abrupt, extreme change.
noun:  (figurative, informal, nonstandard) A large, massive, significant change.
verb:  (slang, esoteric attraction theory) To manifest, to forward the reality of.

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