noun
1. (physics) an abrupt transition of an electron or atom or molecule from one quantum state to another with the emission or absorption of a quantum
• Topics: ↑physics, ↑natural philosophy
2. a sudden large increase or advance
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this may not insure success but it will represent a quantum leap from last summer
• Syn: ↑quantum leap
* * *
a sudden, great and important change, improvement or development
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This discovery marks a quantum leap forward in the fight against cancer.
Useful english dictionary. 2012.