| a. | 1. | Of or pertaining to the southwest; southwesterly; |
| Noun | 1. | Southwestern - a dialect of Middle English Synonyms: West Saxon |
| Adj. | 1. | southwestern - situated in or oriented toward the southwest Synonyms: southwest, southwesterly |
| 2. | southwestern - of a region of the United States generally including New Mexico; Arizona; Texas; California; and sometimes Nevada; Utah; Colorado |