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  1. diminished seventh

    • n.
      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).;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.
    • noun: diminished seventh, plural noun: diminished sevenths