Jisho

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Noun
1. just intonation; pure intonationMusic, See also 純正調
Wikipedia definition
2. Just intonationIn music, just intonation (sometimes abbreviated as JI) or pure intonation is any musical tuning in which the frequencies of notes are related by ratios of small whole numbers. Any interval tuned in this way is called a pure or just interval. The two notes in any just interval are members of the same harmonic series. Frequency ratios involving large integers such as 1024:927 are not generally said to be justly tuned.
Read “Just intonation” on English Wikipedia
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Read “Just intonation” on DBpedia

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