The term 'BOOK printing' can be broken down into two crossword solutions: 'EDITION' and 'BOOK'. EDITION is a 7-letter word which refers to the process of producing a BOOK in multiple copies. BOOK is a 4-letter word which refers to a physical or digital collection of written, visual, or other types of content. Together, these two words refer to the process of producing multiple copies of a BOOK, either in physical or digital form.