• synonyms


[kon-suh n-trey-shuh n]
See more synonyms for concentration on Thesaurus.com
  1. the act of concentrating; the state of being concentrated.
  2. exclusive attention to one object; close mental application.
  3. something concentrated: a concentration of stars.
  4. Military.
    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.
  5. the focusing of a student's academic program on advanced study in a specific subject or field.
  6. Chemistry. (in a solution) a measure of the amount of dissolved substance contained per unit of volume.
  7. 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.
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Origin of concentration

First recorded in 1625–35; concentr(ic) + -ation
Related formshy·per·con·cen·tra·tion, nounnon·con·cen·tra·tion, nouno·ver·con·cen·tra·tion, nounpre·con·cen·tra·tion, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words for concentration

absorption, consolidation, combination, accumulation, assembly, compression, deliberation, application, fixing, study, narrowing, unity, convergence, congregation, need, heed, centralization, debate, concern, converging

Examples from the Web for concentration

Contemporary Examples of concentration

Historical Examples of concentration

  • And how was I to know, then, that the concentration was due to the necessity of invention?

    The Fortune Hunter

    Louis Joseph Vance

  • He has the constitution of a rhinoceros, the digestion of an ostrich, and the concentration of an oyster.

    Little Dorrit

    Charles Dickens

  • Oh, gentlemen, have ye ever seen such a concentration of vice?

    Micah Clarke

    Arthur Conan Doyle

  • “Quite,” said Barter, whose face was now a mask of concentration.

    The Mind Master

    Arthur J. Burks

  • Let us now consider some of the implications of this concentration on rendering service.

    Creating Capital

    Frederick L. Lipman

British Dictionary definitions for concentration


  1. intense mental application; complete attention
  2. the act or process of concentrating
  3. something that is concentrated
  4. 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)Symbol: c
  5. the process of increasing the concentration of a solution
  6. military
    1. the act of bringing together military forces
    2. 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
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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

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.

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Online Etymology Dictionary, © 2010 Douglas Harper

concentration in Medicine


  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.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

concentration in Science


  1. The amount of a particular substance in a given amount of another substance, especially a solution or mixture.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.