GRADATORY is a 9 letter word that starts with G.

1. \Grad"a*to*ry\, a. [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. (Zo["o]l.) Suitable for walking; -- said of the limbs of
      an animal when adapted for walking on land.
   
   

2. \Grad"a*to*ry\, n. [Cf. LL. gradatarium.] (Arch.)
   A series of steps from a cloister into a church.