resonance

Definition (noun): an excited state of a stable particle causing a sharp maximum in the probability of absorption of electromagnetic radiation

Definition (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

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

Definition (noun): a relationship of mutual understanding or trust and agreement between people

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