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quantum

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quan⋅tum

  [kwon-tuhm] noun, plural -ta  [-tuh] , adjective
Use quantum in a Sentence
–noun
1. quantity or amount: the least quantum of evidence.
2. a particular amount.
3. a share or portion.
4. a large quantity; bulk.
5. Physics.
a. the smallest quantity of radiant energy, equal to Planck's constant times the frequency of the associated radiation.
b. the fundamental unit of a quantized physical magnitude, as angular momentum.
–adjective
6. sudden and significant: a quantum increase in productivity.
Origin:
1610–20; n. use of neut. of L quantus how much
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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quan·tum   (kwŏn'təm)   
n.   pl. quan·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.

adj.  Relating to or based upon quantum mechanics.

[Latin, from neuter of quantus, how great; see quantity.]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Word Origin & History

quantum 
1619, "one's share or portion," from L. quantum "how much," neut. sing. of quantus "how great" (see quantity). Introduced in physics by Max Planck, 1900; reinforced by Einstein, 1905. Quantum theory is from 1912; quantum mechanics, 1922; quantum jump is first recorded 1955; quantum leap, 1970.
Online Etymology Dictionary, © 2001 Douglas Harper
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Medical Dictionary

Main Entry: quan·tum
Pronunciation: 'kwänt-&m
Function: noun
Inflected Form: plural quan·ta /'kwänt-&/
1 : one of the very small increments or parcels into which many forms of energy are subdivided quantum of light>
2 : one of the small molecular packets of a neurotransmitter (as acetylcholine) released into the synaptic cleft in the transmission of a nerve impulseacross a synapse
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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Medical Dictionary

quantum quan·tum (kwŏn'təm)
n. pl. quan·ta (-tə)

  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.

  3. A quantity or an amount.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Science Dictionary
quantum   (kwŏn'təm)  Pronunciation Key 
Plural quanta
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. See also quantum state.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Computing Dictionary

quantum
time slice

The Free On-line Dictionary of Computing, © 1993-2007 Denis Howe
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