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From Biology-Online Dictionary | Biology-Online Dictionary
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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. (Science: zoology) Suitable for walking; said of the limbs of an animal when adapted for walking on land.

See: grade.