a key (frequently labeled Esc) found on most computer keyboards and used for any of various functions, as to interrupt or cancel the current process or running program, or to close a pop-up window.
Also, escape key.
Also called Escape, Esc key.
Contemporary definitions for Escape key
noun
a key on a computer keyboard which transmits a signal to cancel an operation and whose effect depends on the software or mode in which it is being used