1. (adj)Southwestern, West Saxon a dialect of Middle English Antonyms: north, eastern
2. (adj)southwest, southwestern, southwesterly situated in or oriented toward the southwest Synonyms: southwestern, southwest, southwesterly Antonyms: north, eastern
3. (adj)southwestern of a region of the United States generally including New Mexico; Arizona; Texas; California; and sometimes Nevada; Utah; Colorado Synonyms: southwest, southwesterly Antonyms: eastern, north