probability meaning and definition

PROBABILITY noun

Definition of probability (noun)

1. a measure of how likely it is that some event will occur; a number expressing the ratio of favorable cases to the whole number of cases possible
   • "the probability that an unbiased coin will fall with the head up is 0.5"
   • synonyms: 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"
   • antonym: improbability