Pitch difference - Onteisa

Japanese: 音程差 - おんていさ
Pitch difference - Onteisa

...This makes it possible to use many more keys than with Pythagorean tuning or just intonation, but the disadvantage is that keys with many key signatures produce very unpleasant dissonances.
[12-tone equal temperament]
Generally speaking, equal temperament refers to a tuning system that is practically useful, which adjusts the minute interval differences (commas) that occur in Pythagorean tuning or just intonation. It is broadly divided into equal temperament and unequal temperament, and there are various types of each, and the aforementioned meantone temperament is nothing more than a type of unequal equal temperament. …

*Some of the terminology explanations that mention "pitch difference" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…これによって,ピタゴラス音律や純正律に比べて多くの調が実用可能となったが,調号の多い調ではきわめて耳ざわりな不協和音の生じるのが欠点である。
[12平均律]
 一般に平均律とは,ピタゴラス音律や純正律で生じる微小な音程差(コンマ)を調整して実用に便利なものとした音律を指す。それは等分平均律と不等分平均律に大別され,そのおのおのについてもさまざまな種類があって,前述の中全音律も不等分平均律の一種にほかならない。…

※「音程差」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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