A slot in a plane surface, especially an airfoil, that allows for flow through the structure. Also: A slot in the fuselage or tail of an aircraft used for attaching a radio antenna, etc.

A device that accepts cash or, in “ticket-in, ticket-out” machines, a paper ticket with a barcode that is scanned at the machine’s outlet. It then displays a series of reels and pays out credits based on the symbols that line up on the pay table. The symbols vary by machine, but classics include fruits, bells, and stylized lucky sevens. Most slot games have a theme, and the symbols and bonus features are aligned with that theme.

Many problem gamblers report that they enjoy playing slots because the intermittent rewards keep them occupied and distract them from thinking about negative aspects of their lives, a phenomenon known as the “slot effect.” Teaching problem gamblers to be more mindful in their daily activities may help them avoid becoming addicted to gambling (Abbot & Volberg, 1996; Chen, Jindani, & Perry, 2014).