IPA: /nɒnˈɔːθər/
KK: /nɑːˈɔːθər/
A person who does not create or write original content, such as books or articles.
In the world of publishing, a nonauthor may contribute ideas but not write the final text.
Nonauthor is formed from "non-" (meaning not) and "author" (from Latin "auctor", meaning creator or originator). The word describes someone who is not an author or creator.
Think of 'non-' meaning 'not' and 'author' meaning 'creator' — so a nonauthor is someone who is not a creator.