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A '''subfifth''', '''infrafifth''' or '''semidiminished fifth''' is an [[interval]] that spans four steps of the [[5L 2s|diatonic]] scale with a quality between diminished and perfect. It exists in [[neutralization|neutralized]] diatonic scales as exactly one half of a minor ninth. 

In [[just intonation]], an interval may be classified as a subfifth if it is reasonably mapped to [[7edo|4\7]] and [[24edo|13\24]] (precisely four steps of the diatonic scale and six and a half steps of the chromatic scale).

As a concrete [[interval region]], it is typically near 650{{cent}} in size. It is too narrow to sound like a [[perfect fifth]] and too wide to sound like a [[tritone]]. [[Margo Schulter]], in her article [http://www.bestii.com/%7Emschulter/IntervalSpectrumRegions.txt Regions of the Interval Spectrum], proposes an approximate range for a subfifth to be from 640{{cent}} to 672{{cent}}. Of course, this categorization should not be taken for granted. Since music is subjective and culturally influenced, the borders of what is a superfourth are "fuzzy". Other descriptions are possible and legitimate.

Some of the simplest subfifths in [[just intonation]] are [[16/11]] (about 649{{c}}) and [[22/15]] (about 663{{c}}), both undecimal (11-based) subfifths; and [[35/24]] (about 653{{c}}) and [[72/49]] (about 666{{c}}), both septimal (7-based) subfifths.

Information about subfifths in the conventional interval region format may be found at [[Tritone]].

The inversion of a subfifth is a [[superfourth]].

== See also ==
* [[Superfourth]] – the [[octave complement]] region

{{Navbox intervals}}

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