Pronunciation: (rez'u-nā"tur),[key] —n. 1. anything that resonates.
2. an appliance for increasing sound by resonance.
3. an instrument for detecting the presence of a particular frequency by means of resonance.
4. Electronics. a. a hollow enclosure (cavity resonator) made of conducting material of such dimensions that electromagnetic radiation of a certain frequency will resonate.
b. any circuit having this frequency characteristic.