More importantly, what defines a book as a 'teen' novel or, come to that, a thriller?
As a reader I define a book as "great" if I'm still thinking about it long after I've finished it.
For statistical purposes, however, the United Nations Educational, Social and Cultural Organization defines a book as "a non-periodical printed publication of at least 49 pages excluding covers".
If we assume that subject matter is what defines a book as "young adult," it doesn't make much sense to discourage adults from reading a book with that label.
"One of the most interesting things about the list is that it calls into question how we define a book as academic, underlining the fact that when we consider the future of the academic book we must also question our own assumptions," said Alan Staton, head of marketing at the Booksellers Association.
Gödel defines a book-keeping device, a well-ordering of all tuples of variables arising from a need to satisfy φ as dictated by (Q).
It won't define a word, unless the book happens to be a lexicon or have a glossary.
The nonprofit organization Multicultural Children's Book Day defines a multicultural book as a work that includes characters of color and characters that represent a minority point of view, as well as books that share information about different cultures, races and religions.
That condition, the bane of the middle class, is defined in a book of the same name as "a painful, contagious, socially transmitted condition of overload, debt, anxiety and waste resulting from the dogged pursuit of more".
