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Synonyms
quan·tum (kwŏńtəm)

[Latin from neuter of quantus, how great; see quantity.]

noun: pl., -ta (-tə) 

  1. A quantity or amount.
  2. A specified portion.
  3. Something that can be counted or measured.
  4. Physics
    1. The smallest amount of a physical quantity that can exist independently, especially a discrete quantity of electromagnetic radiation.
    2. This amount of energy regarded as a unit.

adjective 

Relating to or based upon quantum mechanics.