Английский разговорный словарь (основной) - concentration

ˌkɔnsənˈtreɪʃən n. 1 a the act or power of concentrating (needs to develop concentration). b an instance of this (interrupted my concentration). 2 something concentrated (a concentration of resources). 3 something brought together; a gathering. 4 the weight of substance in a given weight or volume of material. øconcentration camp a camp for the detention of political prisoners, internees, etc., esp. in Nazi Germany.