concentration

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♦ con|cen|tra|tion /k'ɒnsəntr'eɪʃən/ (concentrations)
1 [N-UNCOUNT]
Concentration on something involves giving all your attention to it.
Neal kept interrupting, breaking my concentration...
We lacked concentration and it cost us the goal and the game.
2 [N-VAR] usu N of n
A concentration of something is a large amount of it or large numbers of it in a small area.
The area has one of the world's greatest concentrations of wildlife...
There's been too much concentration of power in the hands of central authorities.
3 [N-VAR] with supp, oft N of n, n N
The concentration of a substance is the proportion of essential ingredients or substances in it.
pH is a measure of the concentration of free hydrogen atoms in a solution...con|cen|tra|tion camp (concentration camps)
[N-COUNT]
A concentration camp is a prison in which large numbers of ordinary people are kept in very bad conditions, usually during a war.

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