capable of being supported or upheld, as by having its weight borne from below.
pertaining to a system that maintains its own viability by using techniques that allow for continual reuse: sustainable agriculture. Aquaculture is a sustainable alternative to overfishing.
able to be maintained or kept going, as an action or process: a sustainable negotiation between the two countries.
able to be confirmed or upheld: a sustainable decision.
able to be supported as with the basic necessities or sufficient funds: a sustainable life.