noun 1.the branch of literature comprising works of narrative prose dealing with or offering opinions or conjectures upon facts and reality, including biography, history, and the essay ( opposed to
fiction and distinguished from
poetry and
drama ).
2.works of this class: She had read all of his novels but none of his nonfiction.
3.(especially in cataloging books, as in a library or bookstore) all writing or books not
fiction, poetry, or drama, including nonfictive narrative prose and reference works; the broadest category of written works.
Related forms non·fic·tion·al, adjective
non·fic·tion·al·ly, adverb