Usually means: Minimum possible length in physics.
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We found 6 dictionaries that define the word Planck length:

General (2 matching dictionaries)
  1. Planck length: Wiktionary
  2. Planck length: Wikipedia, the Free Encyclopedia

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

Science (3 matching dictionaries)
  1. Planck Length: Eric Weisstein's World of Physics
  2. Planck Length: Extragalactic Astronomy
  3. How Many? A Dictionary of Units of Measurement (No longer online)

Definitions from Wiktionary (Planck length)

noun:  (physics) A unit of length, believed to be the scale at which quantum gravity effects become significant, that is defined in terms of the speed of light, the gravitational constant and the reduced Planck's constant, namely: ℓ_P=√hbar Gc³≈1.616 252(81)×10⁻³⁵ mbox m

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