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[kon-suh n-trey-shuh n] /ˌkɒn sənˈtreɪ ʃən/
the act of concentrating; the state of being concentrated.
exclusive attention to one object; close mental application.
something concentrated:
a concentration of stars.
  1. the assembling of military or naval forces in a particular area in preparation for further operations.
  2. a specified intensity and duration of artillery fire placed on a small area.
the focusing of a student's academic program on advanced study in a specific subject or field.
Chemistry. (in a solution) a measure of the amount of dissolved substance contained per unit of volume.
Also called memory. Cards. a game in which all 52 cards are spread out face down on the table and each player in turn exposes two cards at a time and replaces them face down if they do not constitute a pair, the object being to take the most pairs by remembering the location of the cards previously exposed.
Origin of concentration
1625-35; concentr(ic) + -ation
Related forms
hyperconcentration, noun
nonconcentration, noun
overconcentration, noun
preconcentration, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for concentration
Contemporary Examples
Historical Examples
  • There was a shuffling about, a confusion in the centre, a concentration of eyes.

    Smith College Stories Josephine Dodge Daskam
  • The enemy's concentration against the centre of our line was complete.

    1914 John French, Viscount of Ypres
  • And it so happened that I had a job that needed all the concentration I could give it.

    Aliens William McFee
  • We have here an example of the concentration of energy in time.

  • Into the depths of his concentration came the odor of tsin-tsin flowers, followed by the familiar, silkie voice of his arch-enemy.

    The Affair of the Brains Anthony Gilmore
British Dictionary definitions for concentration


intense mental application; complete attention
the act or process of concentrating
something that is concentrated
the strength of a solution, esp the amount of dissolved substance in a given volume of solvent, usually expressed in moles per cubic metre or cubic decimetre (litre) c
the process of increasing the concentration of a solution
  1. the act of bringing together military forces
  2. the application of fire from a number of weapons against a target
(economics) the degree to which the output or employment in an industry is accounted for by only a few firms
another name (esp US) for Pelmanism
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for concentration

1630s, "action of bringing to a center," noun of action from verb concentrate (v.). Meaning "a mass so collected" is from 1670s; "continuous focus of mental activity" is from 1846.

Online Etymology Dictionary, © 2010 Douglas Harper
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concentration in Medicine

concentration con·cen·tra·tion (kŏn'sən-trā'shən)

  1. An increase of the strength of a pharmaceutical preparation by the extraction, precipitation, and drying of its crude active agent.

  2. An increase in the strength of a fluid or gas in a mixture by purification, evaporation, or diffusion.

  3. The amount of a specified substance in a unit amount of another substance.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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concentration in Science
The amount of a particular substance in a given amount of another substance, especially a solution or mixture.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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