Intonalism

Intonalism is an approach to musical tuning which combines elements of temperament and just intonation. It is somewhat similar to adaptive JI.

In intonalism, a tempered scale (often 12edo) is used for the lead melody of a piece. The current melody note at any given point in time is then treated as a reference pitch, and the current backing chord uses pure just intonation, tuned relative to the current reference pitch.

Intonalism was described as the "7th Level of Jazz Harmony" by music educator Adam Neely.

The term intonalism is used by William Copper in a different meaning; he defines it as "the science of structuring music according to intonation", where intonation is mostly restricted to 5-limit just intonation.