1. the degree of compactness of a substance; the quantity of something per unit measure
2. the number of people or things in a given area or space
3. the mass of a substance per unit of volume
Usage: physics; chemistry

Examples

• The density of the fog made driving dangerous.
• Population density is highest in urban areas.
• Lead has a much higher density than aluminum.
• The density of the forest blocked out most sunlight.
• Scientists measured the density of the unknown material.
• Traffic density increases during rush hour.
• The density of information in the textbook was overwhelming.