Meaning of DENSITY in English

den ‧ si ‧ ty /ˈdensəti, ˈdensɪti/ BrE AmE noun [uncountable]

1 . the degree to which an area is filled with people or things

density of

the size and density of settlements

areas of high population density

2 . technical the relationship between the ↑ mass of something and its size

Longman Dictionary of Contemporary English.      Longman - Словарь современного английского языка.