Definition: Root refers to a file containing a history of all commands executed on a terminal or command prompt in Linux and macOS. It's often used as a special symbol to represent the root directory of a shell session, which includes directories where one can keep historical versions of scripts, programs, and other files. The word `/..%2f..%2f..%2f..%2f..%2f..%2froot/.bash_history` is used here in the context of keeping track of commands or sessions on a shell session history.