Definition of the gamut noun from the Oxford Advanced Learner's Dictionary

 

the gamut

 noun
noun
BrE BrE//ˈɡæmət//
 
; NAmE NAmE//ˈɡæmət//
 
[singular]
 
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the complete range of a particular kind of thing The network will provide the gamut of computer services to your home. She felt she had run the (whole) gamut of human emotions from joy to despair. The exhibition runs the whole gamut of artistic styles. Word Origin late Middle English: from medieval Latin gamma ut, originally the name of the lowest note in the medieval scale (bass G an octave and a half below middle C), then applied to the whole range of notes used in medieval music. The Greek letter Γ (gamma) was used for bass G, with ut indicating that it was the first note in the lowest of the hexachords or six-note scales.
See the Oxford Advanced American Dictionary entry: the gamut