An Etymological Dictionary of Astronomy and Astrophysics

1. The writer of a book, article, or other text. One who practices writing as a profession.
   

2. An originator or creator, as of a theory or plan.
   

3. Author God.

Etymology (EN): M.E. auctour, from O.Fr. autor, from L. auctor, “creator, enlarger, founder, master, leader,” literally “one who causes to grow,” from auctus, p.p. of augere “to increase,” from PIE root aug- “to increase”.

Etymology (PE): Dâtâr, from Mid.Pers. dâtâr/dâdâr “creator,” from Av. and O.Pers. dâtâr “creator,” from dâ- “to create, make, appoint,” Skt. dhatr “author, creator, preserver, bearer.”
The Mod.Pers. form of this word in classical literary works is dâdâr, used mainly as noun or adjective for “God, the creator.”