commensal: Meaning and Definition of

com•men•sal

1. eating together at the same table.
2. (of an animal, plant, fungus, etc.) living with, on, or in another, without injury to either.
3. (of a person or group) not competing while residing in or occupying the same area as another individual or group having independent or different values or customs.

1. a companion at table.
2. a commensal organism.