just intonation just IN-toe-nay-shun Your browser does not support the audio element. [ English ] Definition A manner of tuning in which the intervals are tuned so that they do not beat (2). In keyboard tuning, this means that the fifths are tuned very small in order to make most of the thirds pure. Share Share on Facebook (opens in a new tab) Share on X (opens in a new tab) Last Updated: 2016-05-19 18:30:52