concentration

Noun

• great and constant diligence and attention

• bringing together military forces

• complete attention; intense mental effort

• increase in density

• strengthening the concentration (as of a solute in a mixture) by removing diluting material

• the spatial property of being crowded together

• the strength of a solution; number of molecules of a substance in a given volume

Related words

• Synonyms: 
  assiduity , assiduousness , engrossment , absorption , immersion , density , denseness , tightness , compactness
• Antonyms: 
  dilution , distribution , dispersion