From WordNet (r) 3.0 (2006) [wn]:
western
adj 1: relating to or characteristic of the western parts of the
world or the West as opposed to the eastern or oriental
parts; "the Western world"; "Western thought"; "Western
thought" [ant: eastern]
2: of or characteristic of regions of the United States west of
the Mississippi River; "a Western ranch" [ant: eastern]
3: lying toward or situated in the west; "our company's western
office"
4: of wind; from the west [syn: westerly, western]
n 1: a film about life in the western United States during the
period of exploration and development [syn: Western,
horse opera]
2: a sandwich made from a western omelet [syn: western,
western sandwich]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Western \West"ern\, a.
[1913 Webster]
1. Of or pertaining to the west; situated in the west, or in
the region nearly in the direction of west; being in that
quarter where the sun sets; as, the western shore of
France; the western ocean.
[1913 Webster]
Far o'er the glowing western main. --Keble.
[1913 Webster]
2. Moving toward the west; as, a ship makes a western course;
coming from the west; as, a western breeze.
[1913 Webster]
Western Church. See Latin Church, under Latin.
Western empire (Hist.), the western portion of the Roman
empire, as divided, by the will of Theodosius the Great,
between his sons Honorius and Arcadius, a. d. 395.
[1913 Webster]