gamut GAH-moot Your browser does not support the audio element. [ Latin ] Definition 1. The range of a voice or instrument. This use of the term arose because of its old meaning of all the notes found on the Guidonian hand. 2. In Medieval theory, the gamut is the note G on the bottom line of the bass clef. 3. The key of G. Share Share on Facebook (opens in a new tab) Share on X (opens in a new tab) Last Updated: 2013-02-14 19:09:31