quantum

quan-tum · noun

imported

Definitions

noun

  1. 1.

    [physics]The smallest discrete unit of a physical property, such as energy or matter.

  2. 2.

    A required or allowed amount; a share or portion.

  3. 3.

    [as adjective]Relating to quantum theory or mechanics.

Forms

plural: quanta

Phrases & expressions

  • •
    quantum leap — A sudden, dramatic advance or change.
  • •
    quantum mechanics — The branch of physics dealing with atomic and subatomic particles.

Related words

See also: particle, photon, physics
Synonyms: amount, quantity

Etymology

From Latin quantum ("how much, how great"), neuter of quantus ("how great"). Adopted into physics by Max Planck in 1900.