plural quantum leaps
Definition of quantum leap
: an abrupt change, sudden increase, or dramatic advance
Note: Quantum leap is rarely used in scientific contexts, but it originated as a synonym of quantum jump, which describes an abrupt transition (as of an electron, an atom, or a molecule) from one discrete energy state to another.
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Merriam-Webster unabridged
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Time Traveler for quantum leap
The first known use of quantum leap was in 1956
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