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