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{{Infobox Interval
{{Infobox Interval
| Icon =
| Name = tridecimal 2/3-tone, trienthird, tridecimal supraminor second, sinaic
| Ratio = 14/13
| Color name = 3uz2, thuzo 2nd
| Monzo = 1 0 0 1 0 -1
| Cents = 128.29824
| Name = tridecimal 2/3-tone, <br>trienthird, <br>sinaic
| Color name =  
| FJS name = M2<sup>7</sup><sub>13</sub>
| Sound = jid_14_13_pluck_adu_dr220.mp3
| Sound = jid_14_13_pluck_adu_dr220.mp3
}}
}}


'''14/13''', the '''2/3-tone''' or '''trienthird''' (one-third third), nicknamed the '''sinaic''' (after Ibn Sina who used it in one of his scales), is a somewhat exotic 13-limit interval measuring about 128.3¢, which is almost exactly 1/3 of a [[5/4]] major third- a stack of three trienthirds falling short of a 5/4 major third by a [[10985/10976|cantonisma]].
'''14/13''', the '''tridecimal 2/3-tone''' or '''trienthird''' (one-third third) is a somewhat exotic 13-limit interval measuring about 128.3¢, which is almost exactly 1/3 of a [[5/4]] major third- a stack of three trienthirds falling short of a 5/4 major third by a [[10985/10976|cantonisma]].


The trienthird was a favorite interval of [[Wikipedia:Avicenna|Avicenna]] (Ibn Sina) for his scale constructions, and may be considered a smaller size of neutral second (a second between major and minor). Thus intervals close in size to it have been called ''sinaics''.
The trienthird was a favorite interval of [[Wikipedia:Avicenna|Avicenna]] (Ibn Sina) for his scale constructions, and may be considered a smaller size of neutral second (a second between major and minor). Thus intervals close in size to it have been called '''sinaics''' by [[Zhea Erose]]. It may be called the '''tridecimal supraminor second''' as well, analogous to [[21/13]] being the ''tridecimal supraminor sixth''.  


In [[13-limit]] [[Just Intonation]], 14/13 represents the difference in size between the tridecimal minor third of [[13/11]] and undecimal major third of [[14/11]]. It is also the difference between [[13/10]] and [[7/5]]; [[13/12]] and [[7/6]]; [[13/9]] and [[14/9]], and of course [[13/8]] and [[7/4]] and the inversions of the above. As it combines the primes 7 and 13, it appears in JI subgroup tunings involving those primes.
In [[13-limit]] [[just intonation]], 14/13 represents the difference in size between the tridecimal minor third of [[13/11]] and undecimal major third of [[14/11]]. It is also the difference between [[13/10]] and [[7/5]]; [[13/12]] and [[7/6]]; [[13/9]] and [[14/9]], and of course [[13/8]] and [[7/4]] and the inversions of the above. As it combines the primes 7 and 13, it appears in JI subgroup tunings involving those primes.


== See also ==
== See also ==
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* [[Gallery of just intervals]]
* [[Gallery of just intervals]]


[[Category:13-limit]]
[[Category:Interval]]
[[Category:Just interval]]
[[Category:Ratio]]
[[Category:Second]]
[[Category:Second]]
[[Category:Neutral second]]
[[Category:Neutral second]]
[[Category:Supraminor second]]
[[Category:Semitone]]
[[Category:Semitone]]
[[Category:Pages with internal sound examples]]