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c.1300, autor "father," from Old French auctor, acteor "author, originator, creator, instigator (12c., Modern French auteur), from Latin auctorem (nominative auctor) "enlarger, founder, master, leader," literally "one who causes to grow," agent noun from auctus, past participle of augere "to increase" (see augment). Meaning "one who sets forth written statements" is from late 14c. The -t- changed to -th- 16c. on mistaken assumption of Greek origin.
...[W]riting means revealing onesself to excess .... This is why one can never be alone enough when one writes, why even night is not night enough. ... I have often thought that the best mode of life for me would be to sit in the innermost room of a spacious locked cellar with my writing things and a lamp. Food would be brought and always put down far away from my room, outside the cellar's outermost door. The walk to my food, in my dressing gown, through the vaulted cellars, would be my only exercise. I would then return to my table, eat slowly and with deliberation, then start writing again at once. And how I would write! From what depths I would drag it up! [Franz Kafka]
1590s, from author (n.). Revived 1940s, chiefly U.S. Related: Authored; authoring.
one who is the source of some form of intellectual or creative work; especially, one who composes a book, article, poem, play, or other literary work intended for publication. Usually a distinction is made between an author and others (such as a compiler, an editor, or a translator) who assemble, organize, or manipulate literary materials. Sometimes, however, the title of author is given to one who compiles material (as for publication) in such a way that the finished compilation can be regarded as a relatively original work. The word is ultimately from the Latin auctor, "authorizer, responsible agent, originator, or maker."