second
musical interval of five semitones spanning three staff positions; in a diatonic scale, either a major second (2 semitones, 1 whole tone) or a minor second (1 semitone)
neutral second
any musical interval wider than a minor second (semitone) but narrower than a major second (whole tone), e.g. those with frequency ratios of 12:11 (lesser undecimal neutral second) or 11:10 (greater undecimal neutral second)
minor second
musical interval of 1 semitone
diminished second
musical interval of less than one semitone spanning two staff positions
augmented second
musical interval
major second
musical interval