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  1. A perfect or minor interval that has been reduced in pitch by a semitone. For example, a perfect fifth is an interval of 7 semitones therefore a diminished fifth is an interval of 6 semitones.
  2. A chord consisting of a major triad with a flattened third and fifth. For example, an A major triad uses the 1st, 3rd and 5th notes of the A major scale (A C# E), therefore an 'A diminished' chord would contain the notes A, C and Eb.

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