Preferred term

symbiosis

Is replaced by

[Henderson's] n. (1) close and usually obligatory association of two organisms of different species living together, not necessarily to their mutual beneﬁt; (2) often used exclusively for an association in which both partners beneﬁt, which is more properly called mutualism. a. symbiotic.

http://vocabs.lter-europe.net/EnvThes/USLterCV_575