1. The inability of the larynx to produce normal speech or singing sounds: Because of the excessive use of her voice in various operas, Natasha experienced aphonia and was unable to continue her career.
2. A loss of a person's voice that can be caused by overuse, disease, or because of psychological reasons; such as hysteria: Meg experienced aphonias on several occasions as a result of her hysterias or neurotic disorders that were characterized by violent emotional outbreaks.

1. A total loss of the voice and of all but whispered speech as a result of hysteria, disease, or overuse of the vocal cords; inability to produce vocal sound.
2. Loss of the voice as a result of a disease, injury, or a structural abnormality.