sixth
musical interval spanning six staff positions
diminished sixth
musical interval of seven semitones spanning six staff positions, enharmonically equivalent to the perfect fifth
minor sixth
musical interval of 8 semitones spanning six staff positions (e.g. from A to F)
neutral sixth
any musical interval wider than a minor sixth but narrower than a major sixth; e.g. 18:11 (undecimal neutral sixth), 13:8 (tridecimal neutral sixth), or the equal-tempered neutral sixth of exactly 8½ semitones
major sixth
musical interval of 9 semitones spanning six staff positions
augmented sixth
musical interval of 10 semitones spanning six staff positions, enharmonically equivalent to the minor seventh