symbiosis
noun
sym·bi·o·sis
ˌsim-bē-ˈō-səs
-ˌbī-
plural symbioses
ˌsim-bē-ˈō-ˌsēz
1
: the living together in more or less intimate association or close union of two dissimilar organisms (as in parasitism or commensalism)
especially
: mutualism
2
: a cooperative relationship (as between two persons or groups)
the symbiosis … between the resident population and the immigrants—
John Geipel
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Merriam-Webster unabridged
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