Abbr. SW The direction or point on the mariner's compass halfway between due south and due west, or 135° west of due north.
An area or region lying in the southwest.
Southwest A region of the southwest United States generally including New Mexico, Arizona, Texas, California, and Nevada and sometimes Utah and Colorado.
adj.
To, toward, of, facing, or in the southwest.
Originating in or coming from the southwest: a southwest wind.
adv. In, from, or toward the southwest. south·west'ern adj.
[south-west; Naut. sou-west] 
