southwestern · adjective1
- Old English · inherited fromsūþwesterne
- Middle English · inherited fromsouthwesterne
- English todaysouthwestern
From Middle English southwesterne, from Old English sūþwesterne, equivalent to south + western.
Southwestern · adjective2
By surface analysis, equally (1) Southwest + -ern or (2) a proprialization from southwestern.
Etymology from Wiktionary, CC BY-SA 4.0.