A narrow opening or notch, such as a keyway in machinery or a slit for coins in a machine. Also:
A position in a schedule or program, or a time period for something to happen. I’ve booked a haircut for you in the 2 pm slot.
In the context of gambling, a slot is an area on the machine’s reels where a specific symbol must land to win. Modern slots use microprocessors to weight the probability of each symbol appearing on a given stop, so that winning combinations appear more frequently than they would on a mechanical machine. In a traditional game, the player inserts cash or, in “ticket-in, ticket-out” machines, paper tickets with barcodes, into the slot to activate the reels. When the reels stop, if enough matching symbols are displayed, the player earns credits according to the pay table listed on the machine. The symbols used in a slot vary according to its theme.
In football, a wide receiver whose primary responsibility is to cover the opposing team’s slot corner (the third defensive back). The slot receiver must be fast and agile to track DB lines and make adjustments after the snap.
In computer programming, a container that stores data for dynamic Web pages or other applications. A slot is a placeholder that either waits for content to be loaded into it (a passive slot) or calls out for it (an active slot). See also data slot, Web slot, and Web space.