Source : Webster's Revised Unabridged Dictionary (1913)

Solubility \Sol`u*bil"i*ty\, n. [Cf. F. solubilit['e].]
   1. The quality, condition, or degree of being soluble or
      solvable; as, the solubility of a salt; the solubility of
      a problem or intricate difficulty.

   2. (Bot.) The tendency to separate readily into parts by
      spurious articulations, as the pods of tick trefoil.

Source : WordNet®

solubility
     n 1: the quality of being soluble [ant: {insolubility}]
     2: the quantity of a particular substance that can dissolve in
        a particular solvent (yielding a saturated solution)