Deus is Latin for "god" or "deity". Latin deus and dīvus "divine", are descended from Proto-Indo-European *deiwos, from the same root as *Dyēus, the reconstructed chief god of the Proto-Indo-European pantheon. Compare Greek Zeus (Ζεύς zdeús; Aeolic Greek Δεύς deús) and Sanskrit देव deva.
In Classical Latin, deus (feminine dea) was a general noun referring to a deity, while in technical usage a divus or diva was a figure who had become divine, such as a divinized emperor. In Late Latin, Deus came to be used mostly of the Christian God. It was inherited by the Romance languages in French dieu, Spanish dios, Portuguese deus, Italian dio, etc.
Read more about Deus: Latin Bible, In Theological Terminology, Latin Phrases With "deus"