In aviation, a slot is an authorization to take-off or land at a specific airport on a specific day during a specified time period. It is distinct from air traffic control clearance, which grants permission to operate an aircraft in an actual flight operation. This concept is also applied to other modes of transport, including ships and trains.

The word slot is also used in the sense of a place or position, as in the expression “he’s got a good slot in the schedule.” For example, an upcoming appointment might be described as a “good slot for it,” meaning that it will fit in well with other commitments and obligations. Similarly, a television program might be scheduled into a regular time slot, such as the eight o’clock slot on Thursdays, or the ten o’clock slot on Monday evenings.

A slot is a narrow, elongated depression, groove, notch, or slit, especially one for receiving something, such as a coin or a letter. A slot may also refer to a position in a sequence or series: The show was scheduled into the seven o’clock slot on Friday evenings.

While the earliest slots were mechanically operated by inserting coins or paper tickets, modern versions are based on computer chips and can accept credit cards, cash, or other forms of payment. They display a virtual reel that spins when the machine is activated, and any symbols that line up on designated lines or paylines win a prize. Some machines are able to award multiple jackpot levels, bonus games, or free spins.

Slot machines are a key revenue generator for casinos, and they are available in many different types and themes. Some slots feature three or more reels, and others include a number of different symbols that can be activated by hitting buttons or using a touchscreen interface. Some are reminiscent of traditional arcade games, while others have more advanced features and graphics.

A slot is the hole in a type-wheel (or other writing apparatus) through which a pin is screwed or inserted. The slot is created by machining or cutting a small hole in the wheel, and it defines the size of the characters produced. It is usually located near the center of the wheel, but can be positioned anywhere along its circumference. The term is also used for a similar structure in other types of writing instruments, such as pencils.