density

den·si·ty

noun \ˈden(t)-sət-ē, -stē\

plural den·si·ties

Definition of DENSITY

1

: the quantity per unit volume, unit area, or unit length: as a : the mass of a substance per unit volume b : the distribution of a quantity (as mass, electricity, or energy) per unit usually of space c : the average number of individuals or units per space unit <a population density of 500 per square mile>

2

a : the degree of opacity of a translucent medium b : absorbance