Emily Dickinson Lexicon

DENS'I-TY, n. [L. densitas.]

1. Closeness of constituent parts; compactness. Density is opposed to rarity; and in philosophy, the density of a body indicates the quantity of matter contained in it, under a given bulk. If a body of equal bulk with another is of double the density, it contains double the quantity of matter.
2. Thickness; as, the density of fog.