Noun

• S: (n) concentration (the strength of a solution; number of molecules of a substance in a given volume)
• S: (n) concentration, density, denseness, tightness, compactness (the spatial property of being crowded together)
• S: (n) concentration (strengthening the concentration (as of a solute in a mixture) by removing diluting material)
• S: (n) concentration (increase in density)
• S: (n) concentration, engrossment, absorption, immersion (complete attention; intense mental effort)
• S: (n) concentration (bringing together military forces)
• S: (n) assiduity, assiduousness, concentration (great and constant diligence and attention)