/eg-zek'/ <operating system> 1. execute.
Unix manual page: execve(2).
2. (Obsolete) executive.
The mainstream "exec" as an abbreviation for (human) executive is *not* used. To a hacker, an "exec" is a always a program, never a person.
4. <operating system> The innermost kernel of the Amiga operating system which provides shared-library support, device interface, memory management, CPU management, basic IPC, and the basic structures for OS extension. The rest of the Amiga OS (windowing, file system, third-party extensions, etc.) is built using these structures.