Etymology
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southwestern (adj.)

Old English suðwesterne; see southwest + -ern. In reference to a section of the U.S., from 1806, when it meant "Mississippi and Alabama."

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Definitions of southwestern
1
southwestern (adj.)
of a region of the United States generally including New Mexico; Arizona; Texas; California; and sometimes Nevada; Utah; Colorado;
southwestern (adj.)
situated in or oriented toward the southwest;
Synonyms: southwest / southwesterly
2
Southwestern (n.)
a dialect of Middle English;
Synonyms: West Saxon
From wordnet.princeton.edu