A narrow opening or groove in something, for example a mail slot or a window in a car door. A slot can also refer to a position in a sequence, series or set.

A slot machine is a gambling device that uses reels to display symbols and pay out credits according to the payout table. A player inserts cash or, in “ticket-in, ticket-out” machines, a paper ticket with a barcode into the designated slot, then activates the machine by pressing a lever or button (physical or virtual) to spin the reels and rearrange the symbols. The winning combination of symbols triggers a payout based on the paytable. Classic symbols include fruit, bells and stylized lucky sevens. Most slot games have a theme and bonus features aligned with that theme.

Slot is also a term used in aviation to refer to the allocation of runway and air traffic control capacity at an airport. Airlines can buy slots to operate at congested airports. Air traffic management slots are allocated by EUROCONTROL, and may be assigned to specific routes or to individual airports.

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