Attention, the cognitive process of selectively focusing on one thing to the exclusion of others

Concentration, in chemistry, the measure of how much of a given substance there is mixed with another substance

Concentration (game show), the NBC television game show

Concentration camp, a detention center created for specific groups of people, usually during wartime

Force concentration, in military tactics, the practice of concentrating military units

Concentration 20, an album by Namie Amuro

Market concentration, in economics, the number and production share of firms in a market (or industry)

Concentration (game), the card game

Mass concentration, in geophysics, a region of a planet or moon's crust that is denser than average

A term used at Brown University, Colgate University, Columbia University, and Harvard College to refer to a type of academic major

Concentration ratio, in economics, a measure of market concentration

More generally, in physics, the number density

Samadhi (Buddhism), mental concentration in Buddhism