Definitions of Sustainability

1. To keep in existence; maintain.
2. To supply with necessities or nourishment; provide for.
3. To support from below
4. To support the spirits, vitality, or resolution of; encourage.
5. To bear up under; withstand: 
6. To experience or suffer: 
7. To affirm the validity of: 
8. To prove or corroborate; confirm.

I interpret this diagram of sustainability to mean that there are many related components of sustainability. the diagram is based off of three main ideas; economic, social and environmental. These ideas are all related and share commons ideas such as equity, bearability, and viability and when we combine all of these elements we get sustainability. Sustainability I think is best  defined as "creating an economic system that provides for quality of life while renewing the environment and its resources. A sustainable community is one that resembles a living system where all of the resources (human, natural, and economic) are renewed and in balance for perpetuity."