quantum

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(pl. quanta)
  1. a (specific) quantity or amount of something.
  2. a unit amount of a physical quantity, especially of electromagnetic energy, such that all other amounts are integral multiples of it. According to the quantum theory, a quantum of energy released during radiation emission or taken up during radiation absorption is equal to h ν, where h is the Planck constant and ν the frequency of the radiation in hertz. A quantum of light (or other electromagnetic energy) is termed a photon.

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