density/ˋdɛnsətI; ˈdensəti or ˈdensIti/n [C,U] plural densities 1 the number of people or things there are in an area, in relation to the size of the area 浓度﹔密度: Taiwan has a high population density . 台湾的人口密度很高。+of the density of housing 住宅密度2 technical the relationship between an object's weight and the amount of space it fills【术语】密度〔物体的重量与其所占空间的比例关系〕