A narrow opening or groove, such as one for accepting coins or letters or a passage through which something may be passed. Also:

The area of a football field that is lined up between the outside wide receivers and the offensive linemen. Slot receivers are typically smaller and quicker than their counterparts at other positions, and they can stretch defenses by running short routes on the route tree such as slants and quick outs. NFL teams have rediscovered the value of slot receivers in recent seasons, and they are often employed on both special team units and in the regular offense.

In a computer, a slot is a position within a device in which a circuit board can be fitted to provide additional capability. For example, a laptop has slots for expansion cards that add functionality such as additional memory, an extra graphics card, or a modem. A slot can also be a place in which a cable or other connector can be inserted to link devices together.

A slot is a term in aviation that refers to an allocated time and space for an aircraft to take off or land, as authorized by an airport or air-traffic control authority. A slot can also refer to an individual berth in a ship, train, or plane, or to the assignment of a job or position: “He got the slot as chief copy editor.” In linguistics, a slot is a specific grammatical role within a construction that can be filled by any of several different words.