Meaning of “author” - Learner’s Dictionary

author

noun [ C ] us uk /ˈɔːθər/
best-selling authorsThe diagram is reproduced by permission of the original author.The author read aloud from his new book.The books are arranged alphabetically by author.He is the author of numerous articles.

B1 someone who writes a book, article, etc:

a popular author of children's fiction

(Definition of “author” from the Cambridge Learner’s Dictionary © Cambridge University Press)