n. Sonorous character or quality: as, the sonorousness of metals, of a voice, of style, etc.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. having the character of a loud deep sound; the quality of being resonant
Word Usage
"The men indeed pride themselves upon speaking it with elegance, impressing upon it a masculine sonorousness, which is peculiarly adapted to the energetic movements of manly eloquence, formerly so much cultivated in Poland."