Usually means: Fundamental constant in quantum electrodynamics.
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We found 8 dictionaries that define the word fine structure constant:

General (4 matching dictionaries)
  1. fine-structure constant: Merriam-Webster
  2. fine-structure constant: Oxford Learner's Dictionaries
  3. fine-structure constant: Wiktionary
  4. Fine-structure constant, Fine structure constant: Wikipedia, the Free Encyclopedia

Computing (1 matching dictionary)
  1. Fine structure constant, fine-structure constant: Encyclopedia

Science (2 matching dictionaries)
  1. Fine Structure Constant: Eric Weisstein's World of Physics
  2. Fine-Structure Constant: Extragalactic Astronomy

Tech (1 matching dictionary)
  1. AUTOMOTIVE TERMS (No longer online)

Definitions from Wiktionary (Fine structure constant)

noun:  Alternative form of fine-structure constant [(electrodynamics) The fundamental physical value α, presumed to be constant, that characterizes the strength of the electromagnetic force. Equal to about 1/137 = 0.0072973525.]

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