The property of being soluble.
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1) the quality or state of being soluble
2) the amount of a substance that will dissolve in a given amount of another substance and is typically expressed as the number of parts by weight dissolved by 100 parts of solvent at a specified temperature and pressure or as percent by weight or by volume
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sol·u·bil·i·ty (sol″u-bilґĭ-te) the quality or fact of being soluble; susceptibility of being dissolved.Medical dictionary. 2011.