Dictionary of English - quantum leap

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In physics, quantum refers to a very small amount of energy, momentum, etc, but in general use quantum leap is often used for a sudden dramatic increase or advance, implying a very large movement. In physics, a quantum jump or leap means 'the abrupt transition of a particle or atom from one energy state to another', so quantum leap is perhaps best used for a sudden increase or advance which, although it may not be large, brings about a dramatic change: The 'last straw' was a 'quantum leap' as far as the camel's back was concerned.

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