1. a person who directs or manages something
2. a device used to operate or regulate a machine or system
3. a handheld device used to play video games

Examples

• The air traffic controller guided the plane safely to the runway.
• She works as a financial controller at a large corporation.
• The TV controller wasn't working, so we had to change channels manually.
• He picked up the game controller and started playing.
• The temperature controller keeps the room at a comfortable level.
• The project controller oversees the budget and timeline.
• My gaming controller needs new batteries.