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Latin word auctor comes from Latin augeo, Latin -ator
augeo (Latin)
(figuratively) I exalt, praise. I enlarge, spread, expand. I exaggerate. I honor, enrich. I increase, augment. I lengthen.
-ator (Latin)
Enlarged form of -tor, used to form agent nouns; -ator, -er.
auctor (Latin)
(Medieval Latin) one who gives increase (hence: an originator, causer, doer, founder). (figuratively) authorship, agency, encouragement. (poetic) the Creator, God. Author. Seller, vendor.