Sonority (9)
I believe the answer is:
resonance
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">sonority</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that sonority can be written as resonance)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for resonance that I've seen before include "continuation of noise" , "Deep, clear, ringing quality" , "Sympathetic vibration" , "Plangency" , "Sound amplification" .)