Source : Webster's Revised Unabridged Dictionary (1913)

Executable \Ex"e*cu`ta*ble\, a.
   Capable of being executed; feasible; as, an executable
   project. [R.]

Source : WordNet®

executable
     adj : capable of being done with means at hand and circumstances
           as they are [syn: {feasible}, {practicable}, {viable},
           {workable}]

Source : Free On-Line Dictionary of Computing

executable
     
         A {binary} file containing a program in
        {machine language} which is ready to be {execute}d (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".
     
        (1997-06-21)