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  • The living together in intimate association of two dissimllar organisms, so that the cohabitation is mutually beneficial.  
  • association of two different species of organisms for mutual benefit, living together
    Source: Noland, George B. 1983. General Biology, 11th Edition. St. Louis, MO. C. V. Mosby
  • The close association of two or more dissimilar organisms where both receive an advantage from the association.