1. To keep in existence; maintain.
2. To supply with necessities or nourishment; provide for.
3. To support from below; keep from falling or sinking;
4. To support the spirits, vitality, or resolution of; encourage.
5. To bear up under; withstand: can’t sustain the blistering heat.
6. To experience or suffer: sustained a fatal injury.
7. To affirm the validity of: The judge has sustained the prosecutor’s objection.
8. To prove or corroborate; confirm.
9. To keep up (a joke or assumed role, for example) competently.
sustainable
1. Capable of being sustained.
2. Capable of being continued with minimal long-term effect on the environment: sustainable agriculture.
Sustainable developments are those which fulfill present and future needs (WECD, 1987) while [only] using and not harming renewable resources and unique human-environmental systems of a site: [air], water, land, energy, and human ecology and/or those of other [off-site] sustainable systems (Rosenbaum 1993 and Vieria 1993).
Let’s take a Holy Shitters look at the word sustainable.