A narrow opening for receiving something, such as a coin or a letter. (Also called a slit or notch.) The slot in a door is narrower than the handle. Linguistics A position in a construction into which a morpheme can be fit; also, an interior opening in a building or other structure, such as the one occupied by the chief copy editor of a newspaper.

The reason that slots are so addictive is that they tap into our craving for knowledge. The surprise that results from a spin of the reels provides an element of mystery that keeps players engaged. In addition, social interaction with other players in a casino lobby or even online with friends can make the experience more fun. Finally, rewards such as tickets to a band’s concert or a nice meal can provide immediate gratification that gives players motivation to keep playing.