interval
physical quantity; ratio between two sonic frequencies, often measured in cents, a unit derived from the logarithm of the frequency ratio
ninth
musical interval spanning nine staff positions
sixth
musical interval spanning six staff positions
eleventh
musical interval spanning 11 staff positions
neutral interval
musical interval
whole tone
basic musical interval
seventh
musical interval spanning six staff positions; either a major seventh (11 semitones) or a minor seventh (10 semitones) in a diatonic scale
thirteenth
musical interval
wolf fifth
particularly dissonant musical interval spanning seven semitones present in most meantone tuning systems
fourteenth
musical interval
quint
musical interval spanning five staff positions; either a perfect fifth, an augmented fifth, or a diminished fifth
fourth
musical interval spanning four staff positions
septimal minor third
musical interval with frequency ratio approximately 7:6 = 1.167 (267 cents)
major fourth
musical interval with a frequency ratio of 11:8=1.375, not present in the 12-tone scale but present in e.g. quarter tone scales, named by Ivan Wyschnegradsky
unison
two or more musical parts sounding the same pitch; an interval of zero size (a frequency ratio of 1:1)
octave
musical interval spanning eight staff positions, including the perfect octave (12 semitones), the diminished octave (11 semitones), and the augmented octave (13 semitones)
diesis
an interval in classical music
semitone
basic musical interval
tenth
musical interval
prime
interval in music spanning only one staff position (e.g. perfect unison or augmented unison)
consonance
simple pitch ratio
Pythagorean interval
musical interval with frequency ratio equal to a power of two divided by a power of three
tritone
musical interval of three adjacent whole tones or six semitones; in a diatonic scale each octave contains 1 tritone (e.g. F–B in C major)
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)
cent
musical interval unit
harmonic seventh
musical interval with a frequency ratio of 7:4 (approximatley 969 cents); slightly narrower than a minor seventh (9:5 under just temperament, 1018 cents); equal temperament (1000 cents) does not distinguish between the two
minor fifth
musical interval with a frequency ratio of 16:11=1.4545…, not present in the 12-tone scale but present in e.g. quarter tone scales, named by Ivan Wyschnegradsky
twelfth
musical interval spanning 12 staff positions
third
musical interval encompassing three staff positions; either a major third (four semitones) or a minor third (three semitones) in diatonic scales
fifteenth
musical interval spanning fifteen staff positions and twenty-four semitones
step
functional unit in music: interval between consecutive notes of a scale
octave designation
named musical interval spanning a perfect octave, not inclusive of the highest pitch