Item between 'minor' and 'major'
Intermediate would work, as it means that it comes between two extremes.
Medium, mid, middle, and median could also work, and are pleasing because they begin with an M so fit with major and minor.
Item between 'minor' and 'major'
Intermediate would work, as it means that it comes between two extremes.
Medium, mid, middle, and median could also work, and are pleasing because they begin with an M so fit with major and minor.