A measure of the extent to which something is degradable(noun)
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Use "degradability" in a sentence
"The question of degradability and landfill reduction is one favorite form of snake oil."
""Degradability of them to seriously threaten America again, degradability of al Qaeda to seriously threaten America again and transfer security and sovereignty responsibility to the Afghan government.""
"Cut-paper objects are not only beautiful as objects, but paper as a material is eco-friendly in its bio-degradability, and its fragility and impermanence adds additional depth to its beauty, I think."