Meantone temperament
Meantone temperaments are musical temperaments; that is, a variety of tuning systems constructed, similarly to Pythagorean tuning, as a sequence of equal fifths, both rising and descending, scaled to remain within the same octave. But rather than using perfect fifths, consisting of frequency ratios of value 3 : 2 {\displaystyle 3:2} , these are tempered by a suitable factor that narrows them to ratios that are slightly less than 3 : 2 {\displaystyle 3:2} , in order to bring the major or minor thirds closer to the just intonation ratio of 5 : 4 {\displaystyle 5:4} or 6 : 5 {\displaystyle 6:5} , respectively.