• noun:   the quality imparted to voiced speech sounds by the action of the resonating chambers of the throat and mouth and nasal cavities
• noun:   a vibration of large amplitude produced by a relatively small vibration near the same frequency of vibration as the natural frequency of the resonating system
• noun:   an excited state of a stable particle causing a sharp maximum in the probability of absorption of electromagnetic radiation
• noun:   having the character of a loud deep sound; the quality of being resonant
• noun:   relation of mutual understanding or trust and agreement between people

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