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.

Keep scrolling for more

Synonyms & Antonyms for concentration


absorption, attention, engrossment, enthrallment, immersion



Visit the Thesaurus for More 

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.
See More

Recent Examples on the Web

In Wisconsin, incumbent Republican Governor Scott Walker carried Waukesha County, with its concentration of wealthy and educated voters, by 34 percentage points. Janet Hook, WSJ, "What the Midterm Election Shows: America’s Two Parties Live In Divergent Worlds," 7 Nov. 2018 The Marine Corps, with its large concentration of people in North Carolina, could be especially affected. Dan Lamothe, The Seattle Times, "With Florence, the military faces a dual mission: Weather the storm and help others," 11 Sep. 2018 For dracaenas, very small concentrations of fluoride can be phytotoxic, meaning that the fluoride can kill plant cells. Willi Evans Galloway, Good Housekeeping, "How to Grow Extra-Lush Lucky Bamboo," 20 Aug. 2018 It is estimated that the average concentration of D-9-THC in recreational marijuana was 3 percent or less in the 1960s, but is at least 14 percent now because of the knowledge as to how to grow a more potent product. Dr. Stephen Mcleod-bryant, miamiherald, "Psychosis often the effect of long-term, recreational marijuana use," 15 June 2018 Such concentration by type of company should be troubling. James Mackintosh, WSJ, "Behemoths Have Dominated the Market Before, but Tech Is Different," 14 June 2018 O'Leary remembers Smith's concentration on the ball being one of his strengths, too. Josh Katzenstein,, "Tre'Quan Smith, Saints' third-round pick, went from keeping stats to collecting them," 6 May 2018 Klein, among others, believes that the concentrations of tritium are low enough that the water can safely be released into the sea. Vince Beiser, WIRED, "Fukushima’s Other Big Problem: A Million Tons of Radioactive Water," 27 Apr. 2018 Unlike past occurrences, however, the concentrations of sand are much higher this time, with people even complaining of getting it in their mouths, the BBC reported. Allyson Chiu,, "Orange snow blankets Eastern Europe. There's an explanation.," 26 Mar. 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.

See More

First Known Use of concentration

1606, in the meaning defined at sense 2

History and Etymology for concentration

see concentrate entry 1

Keep scrolling for more

Learn More about concentration

Share concentration

Statistics for concentration

Last Updated

26 Nov 2018

Look-up Popularity

Time Traveler for concentration

The first known use of concentration was in 1606

See more words from the same year

Keep scrolling for more

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

Keep scrolling for more

Comments on concentration

What made you want to look up concentration? Please tell us where you read or heard it (including the quote, if possible).


to move with a clumsy heavy tread

Get Word of the Day daily email!

Test Your Vocabulary

Late Autumn 2018 Words of the Day Quiz

  • frosted-autumn-leaves
  • Which is a synonym of yahoo?
True or False

Test your knowledge - and maybe learn something along the way.


Test Your Knowledge - and learn some interesting things along the way.


Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!