density

noun (plural densities)

• 1the degree of compactness of a substance:a reduction in bone density
• (also packing density) Computing a measure of the amount of information on a storage medium: [as modifier, in combination]:a low-density floppy disk
• Physics the quantity of mass per unit volume of a substance.
• the opacity of a photographic image.

• 2the quantity of people or things in a given area or space:areas of low population density [count noun]:a density of 10,000 per square mile