My definitions of sustainability

1. Sustainability definition 1

    Sustainability is the ability to maintain a certain status or process in existing systems. The most frequent use of the term “sustainability” is connected to biological or human systems in the context of ecology. The ability of an ecosystem to function and maintain productivity for a prolonged period is also sustainability.
   
   
   http://www.benefits-of-recycling.com/definitionforsustainability/

2. Sustainability definition 2

    Sustainability is the ability to continue a defined behavior indefinitely. To define what environmental sustainability is we turn to the experts.
   
   
   http://www.thwink.org/sustain/glossary/EnvironmentalSustainability.htm
   
   
   
   

3. Sustainability  definition 3

   Sustainability is the careful and efficient stewardship of resources by businesses, communities and citizens . It is the practice of meeting our needs in ways that are respectful of the future generations and restoreative of natural , cultural and financial assets.
   
   
   http://natcapsolutions.org/about/sustainability-defined/#.U_YdvmNDTYQ