From the description: "The term 'hacker' has been redefined to consist of anyone who has an insatiable curiosity as to how things work—and how they can try to m

From the description: "The term 'hacker' has been redefined to consist of anyone who has an insatiable curiosity as to how things work—and how they can try to make them better. This book is aimed at hackers of all skill levels..." It's pretty clear what he means by "Hacker" and why he used it.