southwestern united states is a noun meaning "the southwestern region of the United States generally including New Mexico, Arizona, Texas, California, and sometimes Utah and Colorado". It carries one recorded sense.
the southwestern region of the United States generally including New Mexico, Arizona, Texas, California, and sometimes Utah and Colorado
Definitions, synonyms and semantic relations for southwestern united states come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.