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concentration US English

The action or power of focusing one’s attention or mental effort

concentration US Thesaurus

a task requiring concentration

concentration camp US English

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

galactic concentration US English

A tendency for stars (or other celestial objects) to occur in greater abundance closer to the galactic equator.