"concentration" in the noun sense
1. concentration
the strength of a solution number of molecules of a substance in a given volume
2. concentration, density, denseness, tightness, compactness
the spatial property of being crowded together
3. concentration
strengthening the concentration (as of a solute in a mixture) by removing diluting material
4. concentration
increase in density
5. concentration, engrossment, absorption, immersion
complete attention intense mental effort
6. concentration
bringing together military forces
7. assiduity, assiduousness, concentration
great and constant diligence and attention
Source: WordNet® (An amazing lexical database of English)
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