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bits per inch, bpi
a measure of how densely information is packed on a storage medium
flux, flux density
(physics) the number of changes in energy flow across a given surface per unit area
absorbance, optical density, photographic density, transmission density
(physics) a measure of the extent to which a substance transmits light or other electromagnetic radiation
low density, rarity, tenuity
a rarified quality
the ratio of the density of something to the density of a standard
the density of a substance relative to the density of water
vapor density, vapour density
the density of a gas relative to the density of hydrogen