n.1 the whole series or range or scope of anything (the whole gamut of crime).
2 Mus. a the whole series of notes used in medieval or modern music. b a major diatonic scale. c a people's or a period's recognized scale. d a voice's or instrument's compass.
3 Mus. the lowest note in the medieval sequence of hexachords, modern G on the lowest line of the bass staff.
Etymology: med.L gamma ut f. GAMMA taken as the name for a note one tone lower than A of the classical scale + ut the first of six arbitrary names of notes forming the hexachord, being syllables (ut, re, mi, fa, so, la) of the Latin hymn beginning Ut queant laxis)