Source : Webster's Revised Unabridged Dictionary (1913)

Sonority \So*nor"i*ty\, n. [L. sonoritas.]
   The quality or state of being sonorous; sonorousness.

Source : WordNet®

sonority
     n : having the character of a loud deep sound; the quality of
         being resonant [syn: {plangency}, {resonance}, {reverberance},
          {ringing}, {sonorousness}, {vibrancy}]