Usually means: Quantum mechanics fundamental energy unit.
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We found 10 dictionaries that define the word Planck constant:

General (7 matching dictionaries)
  1. Planck constant: Merriam-Webster
  2. Planck constant: Oxford Learner's Dictionaries
  3. Planck constant: Collins English Dictionary
  4. Planck constant: Wiktionary
  5. planck constant: Dictionary.com
  6. Planck constant: Wikipedia, the Free Encyclopedia
  7. Planck constant: TheFreeDictionary.com

Computing (1 matching dictionary)
  1. Planck constant: Encyclopedia

Medicine (1 matching dictionary)
  1. Planck constant: Medical dictionary

Science (1 matching dictionary)
  1. Planck Constant: Extragalactic Astronomy

Definitions from Wiktionary (Planck constant)

noun:  Alternative form of Planck's constant [(quantum mechanics) the constant of proportionality (symbol ℎ), relating the energy and frequency of a photon (6.626×10⁻³⁴ joule-second); also related to the indeterminacy limit in the Heisenberg uncertainty principle; the quantum of action]

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