the act of concentrating; the state of being concentrated.
exclusive attention to one object; close mental application.
something concentrated: a concentration of stars.
the assembling of military or naval forces in a particular area in preparation for further operations.
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.

1625–35; concentr(ic) + -ation

hyperconcentration, noun
nonconcentration, noun
overconcentration, noun
preconcentration, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
concentration (ˌkɒnsənˈtreɪʃən)
1.  intense mental application; complete attention
2.  the act or process of concentrating
3.  something that is concentrated
4.  c 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)
5.  the process of increasing the concentration of a solution
6.  military
 a.  the act of bringing together military forces
 b.  the application of fire from a number of weapons against a target
7.  economics the degree to which the output or employment in an industry is accounted for by only a few firms
8.  another name (esp US) for Pelmanism

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1630s, "action of bringing to a center," noun of action from verb concentrate (q.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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American Heritage
Medical Dictionary

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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American Heritage
Science Dictionary
concentration   (kŏn'sən-trā'shən)  Pronunciation Key 
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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