In a manner relating to an author or in the way that an author would do something.
Adverbial form of 'authorial' created by adding '-ly' (from Old English 'lice' meaning 'like' or 'manner'). This allows the adjective to modify verbs and describe how actions are performed.
The adverb form is rarely used in everyday speech, which actually shows us something interesting: we describe things as 'authorial' but rarely describe actions as being done 'authorially'—English grammar reflects what we actually need to say.
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