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Noun: probability  ,pró-bu'bi-li-tee
  1. A measure of how likely it is that some event will occur; a number expressing the ratio of favourable cases to the whole number of cases possible
    "the probability that an unbiased coin will fall with the head up is 0.5";
    - chance
     
  2. The quality of being probable; a probable event or the most probable event
    "for a while mutiny seemed a probability"; "going by past experience there was a high probability that the visitors were lost"

Derived forms: probabilities

Type of: amount, measure, quality, quantity

Antonym: improbability

Encyclopedia: Probability