How is Null-A defined in the novel, The World of Null-A?

"Null-A" means non-Aristotelian, as well as non-Newtonian and non-Einsteinian. In The World of Null-A, a future Earth is dominated by the Null-A philosophy. Humanity is slowly educating itself toward sanity after centuries of following Aristotle's view of the universe. As an educational film explains to Gosseyn, animals make mistaken associations that may be fatal.