Noun

(densities)

(physics) A measure of the amount of matter contained by a given volume.

* {{quote-magazine, year=2013, month=May-June, author=Kevin Heng

, title= Why Does Nature Form Exoplanets Easily? , volume=101, issue=3, page=184, magazine=(American Scientist) , passage=In the past two years, NASA’s Kepler Space Telescope has located nearly 3,000 exoplanet candidates ranging from sub-Earth-sized minions to gas giants that dwarf our own Jupiter. Their densities range from that of styrofoam to iron.}}

(senseid)The ratio of one quantity to that of another quantity.

(senseid)The probability that an event will occur, as a function of some observed variable.