gradatory

from The Century Dictionary.

• Proceeding step by step; gradual.
• Suitable or adapted for progression or forward motion: an epithet formerly applied to the extremities of a quadruped which arc equal or nearly so, and adapted for ordinary progression on dry land.
• noun In eccles. arch., a series of steps from the cloisters into the church.

from the GNU version of the Collaborative International Dictionary of English.

• adjective Proceeding step by step, or by gradations; gradual.
• adjective (Zoöl.) Suitable for walking; -- said of the limbs of an animal when adapted for walking on land.
• noun (Arch.) A series of steps from a cloister into a church.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun architecture A series of steps from a cloister into a church.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• adjective taking place by degrees