Quantum definitions

kwŏn'təm
Quantum is a specified amount or portion.

An example of quantum is twelve sheep.

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A quantity or amount.
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A specified portion.
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Something that can be counted or measured.
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A unit of acetylcholine, released at the synaptic cleft of a neuromuscular junction.
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The smallest amount of a physical quantity that can exist independently, especially a discrete quantity of electromagnetic radiation.
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This amount of energy regarded as a unit.
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Relating to or based upon quantum theory.
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Quantity, or amount.
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A specified quantity; portion.
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In the quantum theory, a (or the) fixed, elemental unit, as of energy, angular momentum, etc.
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A discrete, indivisible manifestation of a physical property, such as a force or angular momentum. Some quanta take the form of elementary particles; for example, the quantum of electromagnetic radiation is the photon, while the quanta of the weak force are the W and Z particles.
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An amount; the necessary or desired portion; the required or needed amount or share.
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The elementary quantity of radiant energy, a photon. See also photon.
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(now chiefly South Asia) The total amount of something; quantity. [from 17th c.]
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The amount or quantity observably present, or available. [from 18th c.]
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(physics) The smallest possible, and therefore indivisible, unit of a given quantity or quantifiable phenomenon. [from 20th c.]
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(mathematics) A definite portion of a manifoldness, limited by a mark or by a boundary.

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Of a change, sudden or discrete, without intermediate stages.
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(informal) Of a change, significant.
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(physics) Involving quanta.
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(computing theory) Relating to a quantum computer.
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Origin of quantum

From Late Latin quantum, noun use of neuter form of Latin quantus (“how much").