1 a an interaction between two different organisms living in close physical association, usu. to the advantage of both (cf. ANTIBIOSIS). b an instance of this.
2 a a mutually advantageous association or relationship between persons. b an instance of this.
Derivatives:
symbiotic adj. symbiotically adv.
Etymology: mod.L f. Gk sumbiosis a living together f. sumbioo live together, sumbios companion (as SYN-, bios life)
Useful english dictionary. 2012.