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Meaning of gradability

grad•a•bil•i•ty

Pronunciation: (grā"du-bil'i-tē), [key]
— n. Transp.
  1. a measure of a truck's pulling power expressed as the steepest grade the truck can climb with a full load.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.