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[L. resonantia, resound]
1. The quality or act of resounding.
2. The quality of the sound heard on percussion of a hollow structure such as the chest or abdomen. An absence of resonance is termed flatness; diminished resonance, dullness.
3. In physics, the modification of sound caused by vibrations of a body that are set up by waves from another vibrating body.
4. In electricity, a state in which two electrical circuits are in tune with each other.