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Merriam-Webster's Collegiate Dictionary den·si·ty (plural -ties) DATE 1598 1. the quality or state of being dense 2. the quantity per unit volume, unit area, or unit length: as a. the mass of a substance per unit volume b. the distribution of a quantity (as mass, electricity, or energy) per unit usually of space (as length, area, or volume) c. the average number of individuals or units per space unit a population density of 500 per square mile a housing density of 10 houses per acre 3. a. the degree of opacity of a translucent medium b. the common logarithm of the opacity English Etymology density c.1600, from Fr. densité (16c.), from O.Fr . dempsité (13c.), from L. densitas "thickness," from densus "thick, dense."http://O.Fr Oxford Advanced Learner's Dictionary-牛津双解-OALD7 density dens·ity / 5densEti / noun(pl. -ities) 1. [U] the quality of being dense ; the degree to which sth is dense 密集；稠密；密度；浓度: population density 人口密度 low density forest 低密度森林 2. [C, U] (physics 物) the thickness of a solid, liquid or gas measured by its mass per unit of volume 密度(固体、液体或气体单位体积的质量): the density of a gas 一种气体的密度 3. [U] (computing 计) the amount of space available on a disk for recording data 密度(磁盘存贮数据的可用空间): a high / double density floppy 高密度/双密度软盘 Oxford Collocations Dictionary for Students of English density noun ADJ. high, low | average an average density of 2.4 people per hectare | population, traffic The population density in this city is very high. VERB + DENSITY calculate, measure DENSITY + VERB change, vary | increase, rise | decrease, fall Webster's Third New International Dictionary, Unabridged den·si·ty \ˈden(t)səd.ē, -)sətē, -)stē, -i\ noun (-es) Etymology: French or Latin; French densité, from Latin densitat-, densitas, from densus + -itat-, -itas -ity 1. : the quality or state of being dense : closeness of texture or consistency : a crowded condition < a fog of great density > < the great density of growth in the jungle > < made difficult by the density of his style > 2. a. : the mass of a substance per unit volume b. : the distribution of a quantity (as mass, electricity, or energy) per unit usually of space (as area, length, or volume) — see energy density, flux density, surface density c. : the average number of individuals or units per space unit < a density of population of about 100 per square mile > 3. : extreme stupidity 4. of an inflorescence : compactness 5. a. : the degree of opacity of any translucent medium : the common logarithm of the opacity b. : the degree of darkening of a photographic film or positive transparency approximately proportional to the mass of metallic silver or dye per unit area |
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