"southwestern" in the noun sense
1. Southwestern, West Saxon
a dialect of Middle English
"southwestern" in the adjective sense
1. southwest, southwestern, southwesterly
situated in or oriented toward the southwest
2. southwestern
of a region of the United States generally including New Mexico Arizona Texas California and sometimes Nevada Utah Colorado
Source: WordNet® (An amazing lexical database of English)
Princeton University "About WordNet®."
WordNet®. Princeton University. 2010.
View WordNet® License