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The word "West" is a Germanic word passed into some Romance languages (ouest in French, oest in Catalan, ovest in Italian, oeste in Spanish and Portuguese). As is apparent in the Gothic term vasi (Visigoths), it stems from the same Indo-European root that gave the Sanskrit vas-ati (night) and vesper (evening) in Latin.
Moving continuously west is following a circle of latitude.
The concept of the Western part of the earth has its roots in the Western Roman Empire and the Western Christianity. During the Cold War "the West" was often used to refer to the NATO camp as opposed to the Warsaw Pact and non-aligned nations. The expression survives, with an increasingly ambiguous meaning.
In Chinese Buddhism, the West represents movement toward the Buddha or enlightenment (see Journey to the West). The ancient Aztecs believed that the West was the realm of the great goddess of water, mist, and maize. In Ancient Egypt, the West was considered to be the portal to the netherworld, and is the cardinal direction regarded in connection with death, though not always with a negative connotation. Ancient Egyptians also believed that the Goddess Amunet was a personification of the West. The Celts believed that beyond the western sea off the edges of all maps lay the Otherworld, or Afterlife.
In Judaism, west is seen to be toward the Shekinah (presence) of God, as in Jewish history the Tabernacle and subsequent Jerusalem Temple faced east, with God's Presence in the Holy of Holies up the steps to the west. According to the Bible, the Israelites crossed the Jordan River westward into the Promised Land. In Islam, while in India, people pray facing towards the west as in respect to India, Mecca is in the West-ward direction.
- The dictionary definition of west at Wiktionary