(music) an interval equal to that of between the second and third harmonics of the harmonic series; in equal temperament, an interval of seven semitones spanning five degrees of the diatonic scale. It is enharmonically equivalent to a diminished sixth.

plural of perfective aspect

(music) A musical interval of the Western twelve-semitone system consisting of twelve semitones and spanning eight degrees of the diatonic scale. It is enharmonically equivalent to an augmented seventh and is commonly referred to as an octave.

(idiomatic) perfectly measured.

Used when someone's mistakes or flaws are acknowledged, to remind that everyone else makes mistakes and has flaws.

(music) an interval that is either a unison, fourth, fifth, or an octave

(colloquial) A crime that is undetected, unattributed to a perpetrator, or otherwise unsolved. / (colloquial) A crime that is unsolved and seemingly unsolvable.

plural of perfect crime

A musical interval of the Western twelve-semitone system consisting of five semitones and spanning four degrees of the diatonic scale. It is enharmonically equivalent to an augmented third.

plural of perfect fourth