density

noun (plural densities)

• the degree of compactness of a substance:a reduction in bone density
• Computing a measure of the amount of information on a storage medium (tape or disk). For magnetic tape it is the amount of information recorded per unit length of tape (bits per inch or millimeter); for a disk, a fixed number of bits per sector, sectors per track, and tracks per disk:chip density doubles every eighteen months [as modifier, in combination]:a low-density 5.25-inch floppy disk a drive capable of handling high-density 1.44 megabyte disks
• Physics degree of consistency measured by the quantity of mass per unit volume.
• the opacity of a photographic image.
• the quantity of people or things in a given area or space:areas of low population density a density of 10,000 per square mile