concentration

noun

1. 1

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

2. 2

   bringing together military forces

3. 3

   great and constant diligence and attention

4. 4

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

5. 5

   the spatial property of being crowded together

6. 6

   complete attention; intense mental effort

7. 7

   increase in density