The word voice has many definitions:

• The sound made by a person using the vocal folds for talking and singing (singers use the voice as an instrument for creating music). The tone of voice may show that a sentence is a question, even if it grammatically is not, and shows emotions such as anger, surprise, happiness; in a request the tone reveals much about how much one wants something, and whether it is asking a favor or more like an order; the tone of saying e.g. "I am sorry" says a lot: it may vary from begging for forgiveness to "I have the right to do this even if you do not like it".
• A section of a choir or other musical ensemble that sings or plays the same part.
• The register of a line of counterpoint, including soprano, alto, tenor, bass. These terms come the section of the choir to which a line would be given (the soprano voice would have been given to the soprano voices).
• The tone of a piece of writing, influenced by its point of view.
• In phonetics and phonology, a phone or phoneme is said to be voiced if it is produced with the vocal folds vibrating. See voice (phonetics).
• In grammar, voice is a verb-form that indicates the relationship between the subject and the action expressed by the verb. See grammatical voice

• vocal loading
• voice analysis
• voice disorders