A robber or outlaw belonging to a gang and typically operating in an isolated or lawless area. The bandit was notorious for his daring heists in the remote mountain villages.
A person who takes unfair advantage of others, often in a business context. The company was run by a bandit who exploited his employees and customers alike.
Informal, chiefly British: a slot machine, especially a "one-armed bandit". He fed another coin into the bandit and pulled the handle.
Military aviation slang: an enemy aircraft that has been positively identified as hostile. "Bandits at three o'clock," the squadron leader warned over the radio.