n.

1. 密集（度），稠密（度）[U][C]
   The area had a population density of five people per square mile.

   该地区人口密度为每平方英里五人。

2. 【物】【化】密度[U]
   The driver had to stop because the density of the fog made it difficult to see.

   由于浓雾使道路很难看清，司机不得不停车。

3. 愚钝[U]

n.

1. the degree of compactness of a substance.
   ▸Computing  a measure of the amount of information on a storage medium.
   ▸the opacity of a photographic image.
2. the quantity of people or things in a given area or space.