Definition of Authorial

Babylon English Dictionary
of or pertaining to an author, by an author, that relates to an author, characteristic of an author, auctorial
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Authorial Definition from Language, Idioms & Slang Dictionaries & Glossaries
Webster's Revised Unabridged Dictionary (1913)
(a.)
Of or pertaining to an author.
  
Webster's Revised Unabridged Dictionary (1913), edited by Noah Porter. About
hEnglish - advanced version

authorial
\au*tho"ri*al\ (&?;), a. of or pertaining to an author. "the authorial &?;we.'"

WordNet 2.0

Adjective
1. of or by or typical of an author; "authorial comments"; "auctorial flights of imagination"
(synonym) auctorial
(pertainym) writer, author