1. southwest, sou'-west, southwestward, SW, compass point, point
usage: the compass point midway between south and west; at 225 degrees
2. Southwest, southwestern United States
usage: the southwestern region of the United States generally including New Mexico, Arizona, Texas, Nevada, California, and sometimes Utah and Colorado
3. southwest, direction
usage: the direction corresponding to the southwestward compass point
4. southwest, location
usage: a location in the southwestern part of a country, region, or city
Adjective
1. southwesterly, southwest, south (vs. north)
usage: coming from the southwest; "the winds are southwesterly"
2. southwest, southwestern, southwesterly, south (vs. north)
usage: situated in or oriented toward the southwest