A symbiotic relationship in which both species benefit.
Clownfish live among the poisonous tentacles of a sea anemone. The clownfish are protected from predators, and they keep the sea anemone clean.
by Diana Stephens February 14, 2005
1 more definition
The act or displaying of affection between two people (most commonly men). It contains a forgiveness clause, and it is not homosexual in any way shape or form.
Dan and Steve radiated with mutualism, accepting one another as an essential part of the other.
by steebitz May 04, 2008