[{"Bold_text": "noun", "List Items": ["the state or quality of being dense; compactness; closely set or crowded condition.", "stupidity; slow-wittedness; obtuseness.", "the number of inhabitants, dwellings, or the like, per unit area:The commissioner noted that the population density of certain city blocks had fallen dramatically.", "Physics.mass per unit volume.", "Electricity.the quantity of electricity per unit of volume at a point in space, or the quantity per unit of area at a point on a surface. current density current density.", "the quantity of electricity per unit of volume at a point in space, or the quantity per unit of area at a point on a surface.", "current density current density.", "the degree of opacity of a substance, medium, etc., that transmits light.", "Photography.the relative degree of opacity of an area of a negative or transparency, often expressed logarithmically.", "Computers.a measure of the compactness of data saved on a storage medium, as disk or tape, or displayed on an electronic screen."]}]