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Noun: sonorousness  só-nu-rus-nus or su'nor-us-nus [N. Amer], só-nu-rus-nus [Brit]
  1. Having the character of a loud deep sound; the quality of being resonant
    - plangency, resonance, reverberance, ringing, sonority, vibrancy, vibrance

Type of: quality, timber [non-standard], timbre, tone