concentration
UK: ˌkɒnsənˈtreɪʃən | US: ˌkɑːnsənˈtreɪʃən
n. the action or power of focusing one's attention or mental effort
n. a close gathering of people or things
n. the relative amount of a particular substance within a mixture
The word "concentration" derives from Latin concentrare, combining con- (together) and centrum (center). It originally referred to gathering things toward a central point, later extending metaphorically to mental focus (19th century) and chemical mixtures (17th century). The root centr- reflects the idea of convergence, preserved in related words like "central" and "eccentric."
Meditation improves mental concentration.
The city has a high concentration of tech companies.
The solution’s salt concentration was measured.
Her concentration was broken by the loud noise.
The artist worked with intense concentration.