ETYM Cf. French solubilité.
In physics, a measure of the amount of solute (usually a solid or gas) that will dissolve in a given amount of solvent (usually a liquid) at a particular temperature. Solubility may be expressed as grams of solute per 100 grams of solvent or, for a gas, in parts per million (ppm) of solvent.
1. The quality of being soluble.
2. The quantity of a particular substance that can dissolve in a particular solvent (yielding a saturated solution).