RESONANTIA

Res·o·nan·ti·a [ rez-uh-NAN-tee-uh ] noun‍ ‍
• Latin root resōnāre, meaning to resonate, to resound, “to sound again”
• Proto-Indo-European root *swen- / *son- “to sound, hum, vibrate”
• Resonance as in echo, reverberation, the quality of being resonant
• re- (again, back) + sonāre (to sound) + -ant- (sounding) + -ia (state, condition)
• Literally: “a sounding back” or “returning sound”