1) Gradational 2) Gradual 3) Graduated 1) Gradational 2) Gradual 
• (a.) Proceeding step by step, or by gradations; gradual. • (a.) Suitable for walking; -- said of the limbs of an animal when adapted for walking on land. • (n.) A series of steps from a cloister into a church.
Grad'a·to·ry adjective [ See Grade .] 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. (Zoology)...
In architecture a gradatory is a series of steps from a cloister into a church.