mutualism mutual • mutualist · · · Info · Definitions · Synonyms · Characters · · mutualism · · Text Latin · · Script 9 · · Length Definitions · · · (noun) the relation between two different species of organisms that are interdependent; each gains benefits from the other. Synonyms: symbiosis. · · Noun Definition 1 Synonyms · · · symbiosis · · Synonym 1 Characters · · a latin small letter a U+0061 i latin small letter i U+0069 l latin small letter l U+006C m latin small letter m U+006D s latin small letter s U+0073 t latin small letter t U+0074 u latin small letter u U+0075