A narrow notch or groove, especially one for receiving something such as a keyway or coin. Also: a position in a group, series, or sequence. (Dictionary of Computing)
In computer science, a slot is an element that allows you to assign values or variables in an expression. A slot can be used to define an input variable, an output variable, or both. A slot can be defined using a built-in slot type such as amount or duration, or by creating a custom slot type. Custom slot types can be created by clicking Add Slot Type from the Slot Types page or in the left pane of the Utterance Editor.
Most modern slot machines look like the old mechanical ones but work on a completely different principle. They use microprocessors that program each reel to weight particular symbols, giving some symbols a much higher probability of appearing than others. This gives the illusion that a symbol has appeared on a payline, even though it might actually have been in a totally different spot on the same reel.
If you’re a fan of slot games, it’s important to read up on which ones have the highest payout percentages. If you’re interested in playing at a new machine, try depositing a few dollars and then see how much money you get back after some time has passed. If you’re not breaking even, it’s likely that the machine isn’t a loose one and you should leave and find another.