resonance

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

(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) having the character of a loud deep sound; the quality of being resonant. Synonyms: plangency, reverberance, ringing, sonorousness, sonority, vibrancy.

(noun) a relationship of mutual understanding or trust and agreement between people. Synonyms: rapport.

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