Auctoris

Auctoris is the genitive singular form of the Latin noun auctor, which means author, originator, or promoter. In English translation, auctoris ordinarily conveys possession or attribution, as in phrases like “the author’s” or “of the originator.”

Grammatical notes: Auctor is a masculine noun of the third declension. Its nominative singular is auctor; genitive singular is auctoris (spelled a-u-c-t-o-r-i-s in full). The form auctori appears in the dative, and auctorem in the accusative, following standard third-declension patterns. The word can refer to the person who creates a work, initiates a project, or originates an action, and it can extend to figurative senses such as a founder or promoter.

Usage: In classical and medieval Latin, auctor often appears in contexts of authorship, origin, or authority. The genitive auctoris is used to attribute a work, decree, or idea to its source, e.g., liber auctoris “the author’s book” or consilium auctoris “the author’s/originator’s plan.” The term can also contribute to related formations such as auctoritas (authority, influence) and auctorizatio (authorization).

Etymology: Auctor derives from a Latin root associated with creation or increase, from the verb augēre “to increase, to cause growth,” through the agent-noun suffix -tor, yielding “one who creates or originates.” The genitive form auctoris reflects the standard third-declension pattern.

See also: auctor, auctoritas, auctorarium

References: Classical Latin dictionaries and grammars, such as Lewis and Short’s Latin Dictionary, provide standard definitions and inflection for auctor and its derivatives.