con·cen·tra·tion AW [concentration concentrations] BrE [ˌkɒnsnˈtreɪʃn]
NAmE [ˌkɑːnsnˈtreɪʃn]
1. uncountable the ability to direct all your effort and attention on one thing, without thinking of other things
This book requires a great deal of concentration.
Tiredness affects your powers of concentration.
2. uncountable ~ (on sth) the process of people directing effort and attention on a particular thing
a need for greater concentration on environmental issues
In his concentration on the job in hand, John allowed his normal vigilance to slip.
3. countable ~ (of sth) a lot of sth in one place
a concentration of industry in the north of the country
4. countable, uncountable the amount of a substance in a liquid or in another substance
glucose concentrations in the blood
concentration noun U
The noise had disturbed his concentration.
attention • • care
full/total/undivided concentration/attention
hold/focus sb's concentration/attention
turn your concentration/attention to sth
Example Bank:
Don's voice from outside broke my concentration.
Evaporation gradually increases the salt concentration of the water.
One momentary lapse in concentration could prove fatal.
She has great powers of concentration for a child her age.
The concentration of nitrates in the drinking water has risen in recent years.
The game requires great concentration.
The greatest concentration of traffic is downtown.
The greatest concentration of traffic is in the city centre.
a look of total concentration on her face
his concentration on his writing
He stressed the need for greater concentration on environmental issues.
The noise had disturbed his concentration.

WordNet Dictionary:
1. the strength of a solution; number of molecules of a substance in a given volume
Syn: density, denseness, tightness, compactness
Ant: distribution
Ant: dilution
Syn: engrossment, absorption, immersion

Webster's 1913 Dictionary:
n.1.The act or process of concentrating; the process of becoming concentrated, or the state of being concentrated; concentration.
Concentration of the lunar beams.
Intense concetration of thought.
2.The act or process of reducing the volume of a liquid, as by evaporation.
The acid acquires a higher degree of concentration.
3.(Metal.) The act or process of removing the dress of ore and of reducing the valuable part to smaller compass, as by currents of air or water.

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