A slot is a dynamic placeholder that either waits for content (a passive slot) or calls out for it (an active slot). Content for slots is dictated by scenarios that use an Add Items to Slot action or a targeter, and the appearance of the contents is dictated by a renderer.
A narrow notch, groove, or opening, as a keyway in a piece of machinery or a slit for a coin in a vending machine. Also, a position in a group, series, or sequence: the chief copy editor’s slot in the Gazette; the time slot reserved by a passenger for his flight.
In an aircraft, a time and place allocated by air-traffic control for an airplane to take off or land: The airline got more slots at major U.S. airports. Also, any of various openings in a wing or tail surface used to assist in the flow of air over the wings during flight.
In a casino, a horizontally or vertically aligned row of symbols on a reel that rotates once a lever is pulled or a bet is made: The slot machines in Las Vegas usually have five reels and pay out when matching symbols line up along one or more pay lines. Other features might include a Wild symbol that substitutes for other symbols or opens bonus levels, and a Multiplier that increases your winnings subject to wagering requirements. You can learn more about these features and how they work by reading the pay table on a particular slot game.