commensality

com·men·sal [kuh-men-suhl]

adjective
1. eating together at the same table.
2. Ecology . (of an animal, plant, fungus, etc.) living with, on, or in another, without injury to either.
3. Sociology . (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.

noun
4. a companion at table.
5. Ecology . a commensal organism.

Origin:
1350–1400; Middle English < Medieval Latin commēnsālis. See com-, mensal2

Related forms
com·men·sal·ism, noun
com·men·sal·i·ty [kom-en-sal-i-tee], noun
com·men·sal·ly, adverb

Source: 
commensality. Dictionary.com. Dictionary.com Unabridged. Random House, Inc.http://dictionary.reference.com/browse/commensality (accessed: May 12, 2014).