Medical Definition of resonance
1: a quality imparted to voiced sounds by vibration in anatomical resonating chambers or cavities (as the mouth or the nasal cavity)
2: the sound elicited on percussion of the chest
3: the conceptual alternation of a chemical species (as a molecule or ion) between two or more equivalent allowed structural representations differing only in the placement of electrons that aids in understanding the actual state of the species as an amalgamation of its possible structures and the usually higher-than-expected stability of the species
Seen and Heard
What made you want to look up resonance? Please tell us where you read or heard it (including the quote, if possible).