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English definition of “density”

density

noun [C or U] uk   /ˈden.sɪ.ti/ us    /-sə.t̬i/

density noun [C or U] (THICKNESS)

C1 (also denseness) the number of people or things in a place when compared with the size of the place: The area has a high/low population density. We were unable to move because of the density of the crowd.Thick, dense and heavy

density noun [C or U] (OF MATTER)

specialized physics the relationship between the mass of a substance and its size: Lead has a high density. Aluminium is low in density.Area, mass, weight and volume in general
(Definition of density from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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SMART Thesaurus: Mass, area, weight & volume in general

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