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 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To concentration
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
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
Cite This Source
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
Cite This Source
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.
Cite This Source
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.
Cite This Source
Example sentences
He understood that he was still weak, but his intense spiritual concentration
  gave him strength and self-confidence.
Cursive is slow, and it requires too much concentration on the shape of the
  printed letter.
Interruptions by technology often break concentration and allow for too much
  dependence on outside sources for ideas.
Technology is taking away our privacy and our concentration, but it is also
  taking away our ability to be alone.
Image for concentration
Copyright © 2014, LLC. All rights reserved.
  • Please Login or Sign Up to use the Recent Searches feature