/-ˈoʊˌsi:z/ 1 biology : the relationship between two different kinds of living things that live together and depend on each other [count] — usually singular ▪ The bacteria exist in a symbiosis with the plant's roots. [noncount] ▪ The bird lives in symbiosis with the hippopotamus. 2 formal : a relationship between two people or groups that work with and depend on each other [count] — usually singular ▪ There is a symbiosis between celebrities and the media. [noncount] ▪ Their professional association was one of symbiosis.






