augmented fourth

== English == === Noun === augmented fourth (plural augmented fourths) (music) A type of tritone in musical composition. It spans four diatonic scale degrees like a perfect fourth but with an extension of a chromatic semitone. The number of diatonic degrees it spans is what distinguishes it from a diminished fifth. e.g. C - F is a perfect fourth, C - F# is an augmented fourth, and C - F♭ is a diminished fourth. ==== Usage notes ==== Aurally and while using well temperament or 12-tone equal temperament, it is impossible to distinguish between an augmented fourth and a diminished fifth. For this reason one would call it a "tritone" in a context such as ear training, but distinguish between an augmented fourth and a diminished fifth when, for example, analysing a score. In most other tunings, however, the augmented fourth and diminished fifth are of different sizes. ==== Related terms ==== augmented fifth diminished fourth perfect fourth ==== Translations ==== === See also === dissonance musical interval tritone