[kon-suh n-trey-shuh n]
  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.

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 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for overconcentration


  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
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 overconcentration



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

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

overconcentration in Science


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