Quantum Definition

kwŏntəm
quanta
noun
Quantity, or amount.
Webster's New World
This amount of energy regarded as a unit.
American Heritage
In the quantum theory, a (or the) fixed, elemental unit, as of energy, angular momentum, etc.
Webster's New World
A specified quantity; portion.
Webster's New World
Something that can be counted or measured.
American Heritage
adjective
Relating to or based upon quantum theory.
American Heritage

Of a change, sudden or discrete, without intermediate stages.

Wiktionary

(informal) Of a change, significant.

Wiktionary

Other Word Forms of Quantum

Noun

Singular:
quantum
Plural:
quanta

Origin of Quantum

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

    From Wiktionary

  • Latin from neuter of quantus how great quantity

    From American Heritage Dictionary of the English Language, 5th Edition

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