quantum leap

British  

noun

1. a sudden highly significant advance; breakthrough

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quantum leap Cultural  

1. In physics, the movement of an electron from one orbit in an atom to another, sending out or taking on a photon in the process. (See Bohr atom.)

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quantum leap Idioms  

1. A dramatic advance, especially in knowledge or method, as in Establishing a central bank represents a quantum leap in this small country's development. This term originated as quantum jump in the mid-1900s in physics, where it denotes a sudden change from one energy state to another within an atom. Within a decade it was transferred to other advances, not necessarily sudden but very important ones.

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Informally, a “quantum leap” may be any great, sudden, or discontinuous change.

Etymology

Origin of quantum leap

C20: from its use in physics meaning the sudden jump of an electron, atom, etc from one energy level to another