Pronunciation: (ku-men'sul),[key] —adj. 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. Sociol.(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.
—n. 1. a companion at table.
2. a commensal organism.