concentration

Universal Words noun 1 [U] 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. * Stress and tiredness affect your powers of concentration. 2 [U] ~ (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 [C] ~ (of sth) a lot of sth in one place: a concentration of industry in the north of the country 4 [C,U] the amount of a substance in a liquid or in another substance: glucose concentrations in the blood