A narrow notch, groove, or opening, as in a keyway in machinery, a slit for a coin in a vending machine, etc. Also: a position in a group, series, or sequence. (Dictionary of Computing)
In computers, a slot is the part of an execution unit that contains the operation issue and data path hardware needed to execute a given instruction in the pipeline. The term is often used synonymously with a block of work that is scheduled to be executed in a certain amount of time.
Many casino players believe that a machine that has gone long without paying off is “due to hit.” While this belief may lead some people to play the same machines over and over, it is not accurate. Different machines pay out at different rates, and there is no guarantee that any particular machine will eventually become “hot.” In fact, the casinos do not place “hot” machines at the ends of aisles because they would merely get more attention than other machines, regardless of their payback percentages. It is much more effective to decide in advance when you want to quit playing, and to cash out a TITO ticket with the remaining money when you have reached that point. This will minimize both the amount of time spent playing and the cost of the fuel consumed.