The Latin DEITY DEUS is a four-letter word meaning 'GOD' or 'DEITY'. It is derived from the Proto-Indo-European root *deiwos, which is also the source of the English word 'DIVINE'. DEUS is used in many Latin phrases and expressions, such as deus ex machina, meaning 'GOD from the machine', and deus vult, meaning 'GOD wills it'. DEUS is also used to refer to the Christian GOD, as well as other gods in various polytheistic religions.