
In music, a ditone (ditonus, from δίτονος, `of two tones`) is the interval of a major third. The size of a ditone varies according to the sizes of the two tones of which it is compounded. The largest is the Pythagorean ditone, with a ratio of 81:64, also called a comma-redundant major third; the smallest is the interval with a ratio of 10.....
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http://en.wikipedia.org/wiki/Ditone

• (n.) The Greek major third, which comprehend two major tones (the modern major third contains one major and one minor whole tone).
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http://thinkexist.com/dictionary/meaning/ditone/
Di'tone` noun [ Greek ... of two tones;
di- =
di`s- twice + ... tone.]
(Mus.) The Greek major third, which comprehend two major tones (the modern major third contains one major and one minor whole tone).
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http://www.encyclo.co.uk/webster/D/100

In music, a ditone was the Greek major third, which comprehend two major tones (the modern major third contains one major and one minor whole tone).
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http://www.probertencyclopaedia.com/browse/VD.HTM

ditone An interval containing two whole tones; a major third; especially, the Pythagorean major third in ancient Greek music, consisting of two major tones.
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http://www.wordinfo.info/words/index/info/view_unit/2160/
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