Not involving or related to the use of the voice. The nonvocal communication between the two friends was evident through their gestures and facial expressions.
Not having the ability to produce vocal sounds. The nonvocal species of frogs rely on visual signals to communicate with each other.
Phonetics: (of a speech sound) voiceless; produced without vibration of the vocal cords. In English, /t/ is typically a nonvocal consonant.