A narrow notch, hole, or other opening, as in a door or wall. Also used: 1. A place or position in a group, series, or sequence.

2. A slot in a computer (software) for holding a file, allowing the user to select it when using the program. 3. A slit or other narrow opening, as in a door, window, or piece of machinery. Also: 1. A place or position in a game, as in the area in front of the goal between the face-off circles on an ice hockey rink.

Modern slots use a video screen instead of mechanical reels and have buttons rather than handles. They generate three-quarters of all casino gambling revenue and have a reputation for addictiveness. Psychologists, such as Robert Breen at Brown University, have found that people who play video slots become addicted to gambling three times faster than those who play other games.