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English definition of “commensalism”

commensalism

noun [U] uk   /kəˈmen.səl.ɪ.zəm/ specialized us  
a relationship between two species in which one gets an advantage from living closely with the other and the other is not affected by itActing, being or existing together
(Definition of commensalism from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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