a system of tuning based on the pure perfect fifth and major third.
Origin of just intonation
First recorded in 1840–50
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British Dictionary definitions for just intonation
a form of tuning employing the pitch intervals of the untempered natural scale, sometimes employed in the playing of the violin, cello, etc
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012