noun (n)

• the strength of a solution; number of molecules of a substance in a given volume(noun.attribute)

  source: wordnet30
• the spatial property of being crowded together(noun.attribute)

  Synonym:
  compactness, denseness, density, tightness
  Antonym:
  dispersion, distribution
  

  source: wordnet30
• strengthening the concentration (as of a solute in a mixture) by removing diluting material(noun.act)

  Antonym:
  dilution
  

  source: wordnet30
• increase in density(noun.event)

  source: wordnet30
• complete attention; intense mental effort(noun.cognition)

  Synonym:
  absorption, engrossment, immersion
  

  source: wordnet30
• bringing together military forces(noun.act)

  source: wordnet30
• great and constant diligence and attention(noun.attribute)

  Synonym:
  assiduity, assiduousness
  

  source: wordnet30
• The act or process of concentrating; the process of becoming concentrated, or the state of being concentrated; concentration.(noun)

  source: webster1913