sus·tain·a·ble

[suh-stey-nuh-buhl]
adjective
1.
capable of being supported or upheld, as by having its weight borne from below.
2.
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.
3.
able to be maintained or kept going, as an action or process: a sustainable negotiation between the two countries.
4.
able to be confirmed or upheld: a sustainable decision.
5.
able to be supported as with the basic necessities or sufficient funds: a sustainable life.

Origin:
sustain + -able

sus·tain·a·bil·i·ty, noun
non·sus·tain·a·ble, adjective
non·sus·tain·a·bil·i·ty, noun
un·sus·tain·a·ble, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
Cite This Source Link To sustainable
00:10
Sustainable is always a great word to know.
So is ninnyhammer. Does it mean:
a fool or simpleton; ninny.
a gadget; dingus; thingumbob.
Collins
World English Dictionary
sustainable (səˈsteɪnəbəl) [Click for IPA pronunciation guide]
 
adj
1.  capable of being sustained
2.  (of economic development, energy sources, etc) capable of being maintained at a steady level without exhausting natural resources or causing severe ecological damage: sustainable development
3.  (of economic growth) non-inflationary

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

sustainable
1610s, "bearable," from sustain + -able. Attested from 1845 in the sense "defensible;" from 1965 with the meaning "capable of being continued at a certain level." Sustainable growth is recorded from 1965. Related: Sustainability (1972).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
High savings were sustainable when the population was younger, wealthy, and
  growing.
But the government will be careful about reversing stimulus measures until it
  is certain the recovery is sustainable.
Eating meat does not cause global warming if it is done in a sustainable way.
Fashion and furniture mainstays are manufacturing products using sustainable
  materials.
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