(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.

plural of perfective aspect

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

(idiomatic) perfectly measured.

plural of perfect crime

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

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

plural of perfect fifth

plural of perfect interval