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Definition of Emergy
1. Noun. (ecology) the total energy used in the life cycle of some product; the available energy of one kind that has to be used up directly and indirectly to make a product or service(reference-book year=2001 first=Howard T. last=Odum coauthors=Elisabeth C. Odum title=A Prosperous Way Down, Principles and Policies id=ISBN=0-87081-610-1 pages=67). ¹
¹ Source: wiktionary.com