(physics) The quantum number (of an atomic orbital) that specifies the energy of an electron in an atom and, hence, which shell it occupies

The quality of being quantal.

(quantum mechanics) A momentary fluctuation in the energy at a point in space due to the Heisenberg uncertainty principle

(physics) A normalized linear combination of an "up" state and a "down" state for, say, the spin of an electron.

Information theory adapted to deal with information held and/or handled by quantum systems, i.e., in which information is measured in qubits instead of classical bits.

(logic, quantum mechanics) A form of non-classical logic which has been abstracted out of quantum mechanics.

Alternative form of pseudoquantitative

Information science adapted to deal with information held and/or handled by quantum systems, i.e., in which information is measured in qubits instead of classical bits.

(prosody) A form of metathesis or transposition involving quantity or vowel length, by which two neighboring vowels – one long, one short – switch their lengths, so that the long one becomes short, and the short one becomes long.

(derogatory) The world of quangos (quasi-autonomous non-governmental organizations); quangos generally.