Northwestern \North`west"ern\, a. Of, pertaining to, or being in, the northwest; in a direction toward the northwest; coming from the northwest; northwesterly; as, a northwestern course. [1913 Webster] Northwestward

Source: The Collaborative International Dictionary of English v.0.48
 

northwestern adj
1: situated in or oriented toward the northwest [syn: northwesterly, northwest]
2: of a region of the United States generally including Washington; Oregon; Idaho; and sometimes Montana; Wyoming

Source: WordNet (r) 2.0
 

Northwestern \North`west"ern\, a. Of, pertaining to, or being in, the northwest; in a direction toward the northwest; coming from the northwest; northwesterly; as, a northwestern course.

Source: Webster's Revised Unabridged Dictionary (1913)