Definitions for quantum leap
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Princeton's WordNet
quantum leap, quantum jump(noun)
a sudden large increase or advance
"this may not insure success but it will represent a quantum leap from last summer"
Wiktionary
quantum leap(Noun)
The discontinuous change of the state of an electron in an atom or molecule from one energy level to another.
quantum leap(Noun)
(metaphorical) An abrupt change.
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"quantum leap." Definitions.net. STANDS4 LLC, 2013. Web. 23 May 2013. <http://www.definitions.net/definition/quantum leap>.

