Form of symbiosis in which one organism profits and the other neither profits nor is harmed.
A relationship between two kinds of living organism whereby one (the commensal) benefits and the other (the host) remains relatively or absolutely unaffected, and which is often obligatory for the commensal.
The symbiotic relationship of two organisms of different species in which neither is harmful to the other and one gains some benefit such as protection or nourishment (e.g., nonpathogenic bacteria in the human intestine).
A mutually beneficial, enduring association between two organisms, wherein one organism receives advantages from the relationship while the other organism remains unaffected, neither experiencing benefits nor harm.