| real number in the interval 0 to 1 attached to a random event and expressing quantitatively how likely the occurrence of that event is Note 1 to entry: Probability can be related to a long-run frequency of occurrence or to a degree of belief that an event will occur. Note 2 to entry: The limiting cases that the event will surely not occur or that it will surely occur are denoted by the probabilities 0 and 1, respectively.
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