symbiosis -
A close, prolonged association between two or more organisms of different species, regardless of benefit to the members.
symbiosis -
Possibly obsolete The state of people living together in community.
Wikipedia
Symbiosis is close and often long-term interactions between different biological species. In 1877 Bennett used the word symbiosis (which previously had been used of people living together in community) to describe the mutualistic relationship in lichens . In 1879 by the German mycologist Heinrich Anton de Bary, defined it as "the living together of unlike organisms.
OmegaWiki Dictionary
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symbiosis A close and mutually beneficial association of organisms of different species.