any acoustic property of a speech sound that may be recorded and analyzed, as its fundamental frequency or formant structure.
an acoustic property that defines a class of speech sounds, especially in distinctive feature analysis, as acute, grave, or diffuse.
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phonetics any of the acoustic components or elements present in a speech sound and capable of being experimentally observed, recorded, and reproduced
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012