the ability to be sustained, supported, upheld, or confirmed.
Environmental Science. the quality of not being harmful to the environment or depleting natural resources, and thereby supporting long-term ecological balance: The committee is developing sustainability standards for products that use energy.

sustain + -ability Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To sustainability
Example sentences
These fish are great choices from a sustainability point of view because they
  eat mostly grain, not other fish.
The use of topsoil dramatizes the difference between temporary and indefinite
Deforestation, a problem everywhere chocolate is grown, has made sustainability
  the word on everybody's lips.
As for an overall improvement in sustainability, a few tweaks in the system
  could make an enormous difference.
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