What is a Slot?
A slot is a narrow opening, such as a keyway or slit. It can also refer to a position in a sequence or series, an assignment, or an opportunity or chance for something to happen. In a slot machine, coins or tickets are placed in a hopper to trigger the reels to stop and reveal symbols, which may be of varying types. The winnings are based on the number of matching symbols or numbers in a row. Some slots offer a fixed amount per payline, while others allow players to select how many lines they wish to wager on each spin.
A position in a sequence or series, an assignable area, or an opportunity or chance for something to occur: He has an important speech this afternoon. —Michael P. Lynch, The New York Times
A position at a newspaper, especially in the copy desk, occupied by a chief copy editor: The job is his slot. —Woody Allen, The Front Page