Professional voice user – someone who uses the voice as a primary means of occupational communication. It encompasses a large number of people working in disparate professions. The crucial aspects of the definition revolve around (1) a requirement for communication by means of the voice and (2) the production of a clear vocal sound that carries with it its own message.
Gould, Wilbur James, M.D. and Rubin, John Stephen, M.D. “Diagnosis and Treatment of Voice Disorders” from Special Considerations for the Professional Voice User. Igaku-Shoin, NY, 1995.