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Noun: mutualism  'myoo-choo-u,li-zum
  1. The relation between two different species of organisms that are interdependent; each gains benefits from the other
    "The relationship between clownfish and sea anemones is a classic example of mutualism";
    - symbiosis

Derived forms: mutualisms

Type of: interdependence, interdependency, mutuality

Encyclopedia: Mutualism