■ noun
1》 the quality of being resonant.
2》 Physics the reinforcement or prolongation of sound by reflection or synchronous vibration.
3》 Mechanics enhanced vibration of an object subjected to an oscillating force close to a natural frequency of the object.
4》 the condition in which an electric circuit produces the largest possible response to an applied oscillating signal.
5》 Physics a short-lived subatomic particle that is an excited state of a more stable particle.
6》 Astronomy the occurrence of a simple ratio between the periods of revolution of two orbiting bodies.
7》 Chemistry the state of having a molecular structure which cannot adequately be represented by a single structural formula but is a composite of two or more structures of higher energy.