Search Result for "commensalism": 
Wordnet 3.0

NOUN (1)

1. the relation between two different kinds of organisms when one receives benefits from the other without damaging it; 



The Collaborative International Dictionary of English v.0.48:

Commensalism \Com*men"sal*ism\, n.
   The act of eating together; table fellowship.
   [1913 Webster]


WordNet (r) 3.0 (2006):

commensalism
    n 1: the relation between two different kinds of organisms when
         one receives benefits from the other without damaging it