A narrow opening or slit, such as one in a door or window. Also called hole, vent, slit, sleeve, and channel. A slot is a space that something fits into, such as a slit in a roof to let water out. You can also slot something into something else, like she slotted the car seat belt into place. The car seat belt slotted in easily. A position in a schedule or program: Visitors can book a time slot a week or more in advance. Also called berth, billet, and position.

A space in a machine or container in which you can place coins to activate games for each spin. Before bill validators and credit meters were added to slots, people dropped cash into them. Today’s slot machines use advance deposits or credits. In some casinos, you can even play for free, if you want to try your luck without spending real money.

Some players believe that a slot machine is due to pay off after going long periods of time without hitting. This belief is false, as the outcome of each slot spin depends on a random number generator, which shuffles symbols before they appear in a reel.

Most slot machines return a percentage of the money put into them to players, though this amount varies from game to game and may be listed in the help section. When reading online reviews of new slot games, be sure to note the game designer’s target payback percentage.