- A frequency at which a circuit, body, system, or phenomena exhibits enhanced vibration, oscillation, response, absorption, amplitude, or the like. For instance, the vibration of a piezoelectric transducer is greatest with the least applied voltage at its resonant frequency. That of a resonant cavity is determined by its geometry, and so on.
- The frequency at which a body or system resonates without an external driving force. Also called natural resonant frequency, or self-resonant frequency.
- synonymresonance frequency