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  1. quan·tum
    IPA[ˈkwän(t)əm]
  2. noun

    • 1. a discrete quantity of energy proportional in magnitude to the frequency of the radiation it represents.

    • 2. an analogous discrete amount of any other physical quantity, such as momentum or electric charge.

    • 3. the unit quantity of acetylcholine released at a neuromuscular junction by a single synaptic vesicle, contributing a discrete small voltage to the measured end-plate potential.

    • 4. a required or allowed amount, especially an amount of money legally payable in damages:

      the court must determine the quantum of compensation due
    • 5. a share or portion:

      each man has only a quantum of compassion
  3. Variation

    • n.: noun: quantum, plural noun: quanta

    • noun

      a discrete quantity of energy proportional in magnitude to the frequency of the radiation it represents.

      an analogous discrete amount of any other physical quantity, such as momentum or electric charge.

    • plural form of quantum
    • noun

      an abrupt transition of an electron, atom, or molecule from one quantum state to another, with the absorption or emission of a quantum.

      another term for quantum leap

    • plural

      the branch of mechanics that deals with the mathematical description of the motion and interaction of subatomic particles, incorporating the concepts of quantization of energy, wave-particle duality, the uncertainty principle, and the correspondence principle.
    • noun

      the basic unit of information in a quantum computer.
    • noun

      a state of a quantized system which is described by a set of quantum numbers.
    • noun

      a branch of complementary medicine that uses low-dosage electromagnetic radiation in the treatment, diagnosis, and prevention of disease.
    • noun

      a reasonable sum of money to be paid for services rendered or work done when the amount due is not stipulated in a legally enforceable contract:
    • plural

      a quantum field theory in which the strong interaction is described in terms of an interaction between quarks mediated by gluons, both quarks and gluons being assigned a quantum number called “color.”.
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