A narrow depression, notch, or slit, esp. one for receiving something, such as a coin or a letter. Also, a position in a series or sequence: Her show has been assigned the eight-o’clock slot on Thursdays.

A device that converts coins into credits or tokens, then displays a series of symbols on its face and/or reels. A player can bet on a single or multiple paylines, which may be configured in horizontal, vertical, diagonal, or zigzag patterns. Today’s slots also often offer special features, such as Wilds that substitute for other symbols to make winning combinations.

The percentage back that a machine is expected to return over time, calculated as the “hold” or return-to-player percentage. This figure is not a guarantee of a win, and should be compared to the percentage payouts listed on a machine’s display panel or paytable.

In airport coordination, a slot is an authorization for a particular aircraft to take off or land at a specific time during a specified day. In the United States and around the world, the number of available slots is limited to prevent repeated delays that result from too many flights trying to take off or land simultaneously. In a conversational bot, slots can be mapped to built-in or custom slot types. For example, the utterance “I want to book two executive rooms for three nights starting tomorrow” can be mapped to the built-in slot type “rooms”. The value of a machine’s slots is a key factor in determining its profitability and the overall casino experience.