from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun An abrupt, large increase, especially in knowledge.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun physics The discontinuous change of the state of an electron in an atom or molecule from one energy level to another.
  • noun metaphorical An abrupt change.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun a sudden large increase or advance


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  • See rolig's excellent observation (and sionnach's response) on quantum. I've been getting this wrong for years.

    December 21, 2008

  • Joey: Hold it. I'm about to make a quantum leap in diaper theory.

    Jesse: Go with it. Go with it. (1-2)

    January 23, 2012