O, what truths profound and executable only in ages and orbs, are supposed in the announcement of every truth!
late 14c., "to carry into effect," from Old French executer (14c.), from Medieval Latin executare, from Latin execut-/exsecut-, past participle stem of exequi/exsequi "to follow out" (see execution). Meaning "to inflict capital punishment" is from late 15c. Related: Executed; executing.
A binary file containing a program in machine language which is ready to be executed (run).
The term might also be, but generally isn't, applied to scripts which are interpreted by a command line interpreter. Executables are distinguished in Unix by having the execute permission bits set, at least for the owner. MS-DOS uses the filename extension ".exe".