just intonation
n (Music, other) 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 and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014