material entity housing unit A material entity that has as parts one or more sites large enough to contain humans, has as part one or more material entities that separates it from other sites, and bears a residence function. Amanda Hicks Housing units are individuated by their residence functions. http://purl.obolibrary.org/obo/aeo.owl https://github.com/ufbmi/OMRSE/wiki/Housing-unit-and-Household