Describing a relationship between two different organisms where one benefits and the other is unaffected; or relating to sharing meals together.
From Medieval Latin commensalis, from com- (with) and mensa (table). Originally meant 'eating at the same table,' later applied in biology to organisms living together.
A remora fish that hitches rides on sharks is commensal—the remora gets free transportation while the shark barely notices, making it nature's perfect freeloader relationship.
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