- In chemistry, the manner in which electrons or electric charges are distributed among the atoms in compounds that are planar and symmetric, particularly those with conjugated (alternating) double bonds; the existence of resonance in the latter case reduces the energy content and increases the stability of compounds; such molecular entities have more than one contriubuting structure, each differing only in the distribution of electrons.
- Sympathetic or forced vibration of air in the cavities above, below, in front of, or behind a source of sound; in speech, modification of the quality (harmonics) of a tone by the passage of air through the chambers of the nose, pharynx, and head, without increasing the intensity of the sound.
- The sound obtained on percussion of a part that can vibrate freely.
- The intensification and hollow character of the voice sound obtained on auscultation over a cavity.
- The natural or inherent frequency of any oscillating system.
Synonym(s): resonant frequency
[L. resonantia, echo, fr. re-sono, to resound, to echo]
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