exec

1. (informal) An executive; a person employed at the executive level.Examples: "An upcoming problem to be thrashed out at a meeting of diskery reps and execs of the American Federation of Radio Artists (AFRA), is the degree of AFRA's jurisdictional claim over singers on records."; "Tony Stark makes you feel He’s a cool exec with a heart of steel. As Iron Man, all jets ablaze, He’s fighting and smiting with repulsor rays! Amazing armor! That’s Iron Man! A blazing power! That’s Iron Man!"; "“All right,” he said, turning to the first sheet of paper inside. “We’re not playing Good Cop/Bad Cop here. Do you know that game?” “Yes, sir. Some captains delegate all the unpopular orders to their exec so he can take the heat.” “Right. Well, I don’t believe in that. If an unpopular order has to be given, the captain should take responsibility for it himself.[…]”"informal

2. (military, informal) An executive officer, i.e. the chief assistant to the commanding officer.Examples: "“'Okay. Report to the exec's office right after inspection tomorrow, Mister Keith. Best of luck.”"informal