resonance (n.)

A term derived from the physics of sound, and used in ACOUSTIC PHONETICS to refer to those vibrations of air movement in the VOCAL TRACT which are set in motion (resonate) by a source of PHONATION. The main resonance chambers of the vocal tract are the mouth, nose and PHARYNX, and these CAVITIES, in their various shapes, act to strengthen some of the FREQUENCIES present in the source of sound, producing the range of human sounds.