Definitions from Wiktionary (quantum leap)

▸ noun:  (quantum mechanics) The discontinuous change of the state of an electron in an atom or molecule from one energy level to another.
▸ noun:  (figurative) An abrupt, extreme change.
▸ noun:  (figurative, informal, nonstandard) A large, massive, significant change.
▸ verb:  (slang, esoteric attraction theory) To manifest, to forward the reality of.
▸ Also see quantum_leap


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