den·si·ty/`dɛnsətɪ; ˈdensɪti/ n [C,U] 1 how many people or things there are in an area, in relation to its size 浓度,密度: Taiwan has a high population density. 台湾的人口密度很高。 2technical 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〕