the key on electric typewriters or computer keyboards that causes a carriage return and a line feed; return
Microsoft Computer Dictionary
n. A key on a keyboard that is used to terminate input of a field or record or to execute the default action of a dialog box. On IBM PCs and compatibles, this key is called ENTER. The corresponding key on a typewriter causes the carriage holding the paper to return to the starting position to begin a new line; hence the name. See also Enter key.