concentration

 
Pronunciation: /kɒns(ə)nˈtreɪʃ(ə)n/

noun

  • 1 [mass noun] the action or power of focusing all one’s attention: she was frowning in concentration
  • (concentration on/upon) dealing with one particular thing above all others: concentration on the needs of the young can mean that the elderly are forgotten
  • 2a close gathering of people or things: the island has the greatest concentration of seabirds in the north-west
  • [mass noun] the action of gathering together closely: the concentration of power in the hands of nobles
  • 3the relative amount of a particular substance contained within a solution or mixture or in a particular volume of space: the gas can collect in dangerous concentrations
  • [mass noun] the action of strengthening a solution by the removal or reduction of the diluting agent or by the selective accumulation of atoms or molecules: by concentration of cell contents and supercooling, frost-hardened plant tissues survive temperatures down to −10°C