Gradatory /(?)/

Grad·a·to·ry

Gradatory

a.
  1. Proceeding step by step, or by gradations; gradual.
    Could we have seen [Macbeth's] crimes darkening on their progress . . . could this gradatory apostasy have been shown us.
    — A. Seward.
  2. Suitable for walking; -- said of the limbs of an animal when adapted for walking on land. (Zool.)

Gradatory

n.
  1. A series of steps from a cloister into a church. (Arch.)