Abbreviation of 西班牙 (スペイン). Used mainly in compound words; not a standalone word for Spain in modern Japanese.
See also: スペイン
西 is an abbreviation of 西班牙 (Spain) and is used in words like 西語 (Spanish language) and 西文学 (Spanish literature).
western part; the west (of a region) · the West (United States)
northwest
southwest
Western Europe · the West; the Occident; Europe
western direction; the west · Western Pure Land; Amitabha's paradise · western fighter; west side wrestler
southwest
west coast; west bank
westward journey; trip to the West
west longitude
going west; heading westward
northwest
western edge; west side
west of ...; ... and westward
westerlies; prevailing westerlies
west-northwest
proceeding west; advancing westward
busy oneself about; be on the move; rush around
western regions of China
western expedition; military campaign to the west
westernmost
due west
the Occident; the West
western Kyoto
going to Spain
distinguished Western philosopher; great Western thinker · Western philosophy
western lands; the West
west wall; west face
memorial rite involving the western sanctum
Abbreviation of 西班牙 (スペイン), an ateji spelling for Spain. The character 西 was chosen for its reading せい, matching the first syllable of スペイン.