gradability or grade·a·bil·i·ty [grey-duh-bil-i-tee] WORD ORIGIN noun Transportation. a measure of a truck’s pulling power expressed as the steepest grade the truck can climb with a full load. Liberaldictionary.com
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. 2019