A narrow opening for receiving or admitting something, such as a coin or a letter. Also called slit, groove, notch, and slot. Usually used with the meaning of a position in a sequence or series: The program received a new time slot on the broadcasting schedule.

A narrow, elongated depression, groove, or notch, often with the shape of a keyhole; also, an opening through which a lock works. Also called door-bolt slot and hole. Often used with the meaning of a position in an arrangement or sequence: The keyholes were aligned through the slot to make the locking process easier.

In airport coordination, the authorization for a plane to take off or land at a particular airfield during a specified time period. This is distinct from air traffic control clearance or similar authorizations, and slots are a tool used to manage the heavy volume of aircraft operations at extremely busy airports, particularly those in the United States, where many flights try to take off or land at the same time.

Many slot games are themed after popular movies, TV shows, or rock bands, which can make them more attractive to players. Unlike other casino games, slot machines tend to be relatively simple and do not require extensive knowledge to play. However, it is still important to know how to read the pay table and understand the rules of each game before playing. Many online casinos allow players to try out their games for free before they deposit any money.