An author's purpose could be his intent or goal.
setback
the authors purpose is the entertain i think
believableconceivablelikelylogicalprobable
available, void
The part of speech for "authors" is a noun, while "purpose" is a noun as well. Together, "authors purpose" is a noun phrase used to refer to an author's intent or reason for writing a piece of work.
what was authors purpose for writing the book oliver twis
he grows way too fast and has a learning disability.
The authors purpose was that Diana and Georgie could find peace with Mrs.Lilian.
impair=hinder, impede
disperse diffuse divide
Did I ask??????
No, authors do not usually state a purpose, but they always have one for writing, even if they can't even think of what it is!