#1 concentration n. the strength of a solution; number of molecules of a substance in a given volume. wn
#2 concentration n. [density, denseness, tightness, compactness] the spatial property of being crowded together. wn
#3 concentration n. strengthening the concentration (as of a solute in a mixture) by removing diluting material. wn
#4 concentration n. increase in density. wn
#5 concentration n. [engrossment, absorption, immersion] complete attention; intense mental effort. wn
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