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symbiosis
WIKTIONARY
symbiosis
Noun
  • A relationship of mutual benefit.
    • A close, prolonged association between two or more organisms of different species that normally benefits both members. An interspecies coöperation. ecology
  • A close, prolonged association between two or more organisms of different species, regardless of benefit to the members. biology
  • (possibly obsolete) The state of people living together in a community.