A narrow notch, groove, or opening, as in 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. He slotted the book into his carry-on bag easily.
In football, a slot receiver is one who lines up in the middle of the field between the outside wide receiver and running back. He tends to be shorter and stockier than typical wide receivers, but he is typically fast and excels at running precise routes. In recent seasons, he has become the focus of many offenses, as defenses are increasingly focusing on stopping him.
The pay table for a slot machine lists the payouts that can be made when symbols listed on it line up on the pay line of the slot machine. The pay table is usually displayed above and below the reels on a traditional mechanical machine, or within the help menu of video slots.
Air traffic management slots are time blocks that airlines can buy to use when an airport is constrained (such as at Heathrow). It has been twenty years since central flow management was introduced in Europe, and it has resulted in significant savings both in terms of delays and fuel burn. In the future, it’s likely that slots will be used on a much wider scale. This will mean that a lot more flights will wait on the ground than would otherwise have to, but these delays will be much less frustrating than they currently are.