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gradability

or grade·a·bil·i·ty

[grey-duh-bil-i-tee]
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noun Transportation.
  1. a measure of a truck's pulling power expressed as the steepest grade the truck can climb with a full load.
Compare grade(def 9).

Origin of gradability

First recorded in 1950–55; grade + -ability
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018