— retrogradatory /re'treuh gray"deuh tawr'ee, -tohr'ee/ , adj.
/re'troh gray day"sheuhn/ , n.
1. backward movement.
2. decline or deterioration.
[ 1545-55; retrogradation- (s. of retrogradatio ), prob. equiv. to L retrograd ( us ) RETROGRADE + -atio -ATION, as trans. of Gk anapodismós ]