If you write something, you are engaged in authorship. If you want a fancy way of asking "Who wrote that letter?" — try, "Who is responsible for the authorship of that letter?" Fancy, indeed!

Authorship can refer to anything, not just the creation of written text; you can have authorship of a new idea, a new cocktail, a new fashion style — anything. And just as doctors practice medicine, or architects architecture, so writers practice authorship; in other words, authorship also means the actual act of authoring or writing.

Definitions of authorship
  1. noun
    the act of creating written works
    “it was a matter of disputed authorship
    synonyms: composition, penning, writing
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    fine writing in praise of trivial or base subjects
    writing a first version to be filled out and polished later
    dramatisation, dramatization
    conversion into dramatic form
    fabrication, fictionalisation, fictionalization
    writing in a fictional form
    the writing of history
    writing a metrical composition (or the metrical structure of a composition)
    novelisation, novelization
    converting something into the form of a novel
    the act of putting something in writing
    the act of writing dictionaries
    the art or practice of writing verse
    type of:
    verbal creation
    creating something by the use of speech and language
  2. noun
    the act of initiating a new idea or theory or writing
    “the authorship of the theory is disputed”
    synonyms: paternity
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    type of:
    creation, foundation, founding, initiation, innovation, instauration, institution, introduction, origination
    the act of starting something for the first time; introducing something new
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