diminished seventh
noun
Music
1
- the interval which is a semitone less than a minor seventh, e.g. from A to G flat (which in equal tuning sounds the same as a major sixth)【乐】减七度（音程）。
2
- （亦作diminished seventh chord）a chord formed by a note together with those above it at intervals of a minor third, a diminished fifth, and a diminished seventh. The resulting chord consists entirely of superimposed minor thirds, and is much used in modern music in modulating between keys.减七度和弦。