plural of fifth wheel

(music) A type of tritone in musical composition comprising six semitones. It spans five diatonic scale degrees like a perfect fifth but narrower by a semitone. The number of diatonic degrees it spans is what distinguishes it from an augmented fourth.

(music) A musical interval of the Western twelve-semitone system consisting of eight semitones and spanning five degrees of the diatonic scale. It is one semitone wider than a perfect fifth and enharmonically equivalent to a minor sixth.

plural of augmented fifth

plural of twenty-fifth

plural of fifth gear

plural of fifth slip

plural of diminished fifth

plural of perfect fifth

someone who belongs to a group that secretly undermines another organization