The action or power of focusing one’s attention or mental effort
a task requiring concentration
A place where large numbers of people, especially political prisoners or members of persecuted minorities, are deliberately imprisoned in a relatively small area with inadequate facilities, sometimes to provide forced labor or to await mass execution. The term is most strongly associated with the several hundred camps established by the Nazis in Germany and occupied Europe in 1933–45, among the most infamous being Dachau, Belsen, and Auschwitz
A tendency for stars (or other celestial objects) to occur in greater abundance closer to the galactic equator.