Definition of "Resonance" :

noun: the quality imparted to voiced speech sounds by the action of the resonating chambers of the throat and mouth and nasal cavities

noun: having the character of a loud deep sound; the quality of being resonant

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: a relationship of mutual understanding or trust and agreement between people