density
/ˈdensɪtɪ/noun
(pl. -ies)［mass noun］
1- the degree of compactness of a substance密度：
a reduction in bone density.
骨密度降低。
1.1
- Physics degree of consistency measured by the quantity of mass per unit volume【物理】密度。
1.2
- the opacity of a photographic image（相片形象的）不透性, 不透明度, 暗度。
1.3
- the quantity of people or things in a given area or space（人口或事物的）密度：
areas of low population density
人口密度低的地区
count noun a density of 10,000 per square mile.每平方英里10,000的人口密度。
1.4
- （亦作packing density）Computing a measure of the amount of information on a storage medium【计算机】信息密度：
as modifier, in combination a low-density floppy disk.低密度软盘。
词源
early 17th cent.: from French densité or Latin densitas, from densus 'dense'.