Part of speech: noun

The act of concentrating, or that which is concentrated; condensation.

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Usage examples "concentration":

  1. Concentration demands interest and enthusiasm. - "Analyzing Character", Katherine M. H. Blackford and Arthur Newcomb.
  2. By volume, it is present in the amount of about one part in ten million, which is fairly heavy concentration for an alien substance of that kind. - "The Year When Stardust Fell", Raymond F. Jones.
  3. We hear frightful stories about this new concentration policy. - "Rainbow's End", Rex Beach.