con·cen·tra·tion | \ ˌkän(t)-sən-ˈtrā-shən , -ˌsen- \

Definition of concentration 

1a : the act or process of concentrating : the state of being concentrated especially : direction of attention to a single object All that noise is disturbing my concentration.

b : an academic major or area of focus within a major The student chose law as his concentration.

2 : a concentrated mass or thing a concentration of wealth in the merchant class

3 : the amount of a component in a given area or volume The ozone concentration in the lower stratosphere has declined.

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Synonyms & Antonyms for concentration


absorption, attention, engrossment, enthrallment, immersion



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Examples of concentration in a Sentence

All that noise is disturbing my concentration. The job required her full concentration. When you're tired it's easy to lose your concentration. There was a concentration on ethics within the agency. There is a concentration of wealth in the cities. He objects to the concentration of power in the hands of a few rich men.
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Recent Examples on the Web

Sink didn't have proper concentration of sanitizer solution. Robert Gundran, azcentral, "Restaurant with no sneeze guard on salsa bar among this week's violations," 11 July 2018 In fact, White Sands has the highest concentration of megafauna tracks in the United States. Hayden Carpenter, Outside Online, "Our Next National Park Could Be in New Mexico," 3 July 2018 Kennett Square Juneteenth Celebration Kennett Square has one of the region’s most impressive concentrations of Underground Railroad sites. Claire Wolters,, "Celebrate Juneteenth at these six family events," 15 June 2018 The health department says some neighborhoods have higher concentrations of rats than others. Lara Korte, WSJ, "New Yorkers Are Complaining More About Rats," 14 June 2018 School officials said Greenman has a high concentration of students whose families have come to Aurora through the World Relief group. Linda Girardi, Aurora Beacon-News, "New England Congregational, Greenman School have special relationship," 8 June 2018 Michigan has the highest concentration of residents of Middle Eastern descent, according to the U.S. Census. Niraj Warikoo, Detroit Free Press, "National Security Council official denounces Michigan's Muslims," 4 June 2018 Those students would be pulled from high-poverty schools, which tend to have a higher concentration of black or Hispanic students. Elizabeth A. Harris, New York Times, "As Calls for Action Crescendo, de Blasio Takes On Segregated Schools," 3 June 2018 The deal will require a green light from the U.K.’s Competition and Markets Authority, and the new group—set to be the country’s largest—would have a particular concentration of locations in England’s north-west and south-east. David Meyer, Fortune, "Google Duplex, Apple and Goldman, Drug Prices: CEO Daily for May 11, 2018," 11 May 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'concentration.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of concentration

1606, in the meaning defined at sense 2

History and Etymology for concentration

see concentrate entry 1

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Statistics for concentration

Last Updated

17 Sep 2018

Look-up Popularity

Time Traveler for concentration

The first known use of concentration was in 1606

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More Definitions for concentration



English Language Learners Definition of concentration

: the ability to give your attention or thought to a single object or activity : the ability to concentrate

: the act of giving your attention to a single object or activity

: a large amount of something in one place


con·cen·tra·tion | \ ˌkän-sən-ˈtrā-shən \

Kids Definition of concentration

1 : close attention to or thought about a subject There is a concentration on math in the curriculum.

2 : the ability to pay close attention I lost my concentration when an ambulance drove past.

3 : a large amount of something or a large number of people in one place


con·cen·tra·tion | \ ˌkän(t)-sən-ˈtrā-shən, -ˌsen- \

Medical Definition of concentration 

1 : the act or action of concentrating: as

a : a directing of the attention or of the mental faculties toward a single object

b : an increasing of strength (as of a solute or a gas in a mixture) or a purifying by partial or total removal of diluents, solvents, admixed gases, extraneous material, or waste (as by evaporation or diffusion)

2 : a crude active principle of a vegetable especially for pharmaceutical use in the form of a powder or resin

3 : the relative content of a component (as dissolved or dispersed material) of a solution, mixture, or dispersion that may be expressed in percentage by weight or by volume, in parts per million, or in grams per liter

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