In April 2018, Amaranth Borsuk began to approach artists, bookbinders, publishers, librarians, and scholars to inquire What is the/a book? The Book: 101 Definitions documents the responses and decenters the author’s voice to draw attention to the many other formulations of what the book is and can be. This book is volume 5 in the Documents series published in collaboration with the Centre for Expanded Poetics (CEP) at Concordia University.