Resonance

noun

1. The quality of being resonant.
2. A resonant sound, echo, or reverberation, such as that produced by blowing over the top of a bottle.
3. The sound produced by a hollow body part such as the chest cavity upon auscultation, especially that produced while the patient is speaking.
4. Something that evokes an association, or a strong emotion.
5. The increase in the amplitude of an oscillation of a system under the influence of a periodic force whose frequency is close to that of the system's natural frequency.