a system of cultivation intended to maintain permanent agriculture or horticulture by relying on renewable resources and a self-sustaining ecosystem.

permaculturist, permaculturalist, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
permaculture (ˈpɜːməˌkʌltʃə)
the practice of producing food, energy, etc, using ways that do not deplete the earth's natural resources
[C20: coined by Bill Mollison (born 1928), Australian ecologist, from perma(nent agri)culture]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Main Entry:  permaculturist
Part of Speech:  n.
Definition:  See permacultural's 21st Century Lexicon
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