ABECEDARIAN is John Gaunt's focus word. It means "of or pertaining to do with the alphabet" or a person that is new at learning something, particularly the alphabet. John chose this focus word because he believed no one would ever use the word in normal conversation, a person would generally say "alphabet" or "alphabetical."
Compared to Philippa Gaunt's focus word, FABULONGOSHOOMARVELISHLYWONDERPIPICAL, it is much shorter, and when they both announce their focus words at the same time, it is often inserted in the middle of Philippa's focus word.