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What does quantum mean?

Looking for the meaning or definition of the word quantum? Here's what it means.

Noun
  1. (now chiefly South Asia) The total amount of something; quantity. [from 17th c.]
  2. The amount or quantity observably present, or available. [from 18th c.]
  3. (physics) The smallest possible, and therefore indivisible, unit of a given quantity or quantifiable phenomenon. [from 20th c.]
  4. (mathematics) A definite portion of a manifoldness, limited by a mark or by a boundary.
  5. (law) A brief document provided by the judge, elaborating on a sentencing decision.
  6. (computing) The amount of time allocated for a thread to perform its work in a multithreaded environment.
Adjective
  1. Of a change, sudden or discrete, without intermediate stages.
  2. (informal) Of a change, significant.
  3. (physics) Involving quanta.
  4. (computing theory) Relating to a quantum computer.
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