probability

Noun

• 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
    

• 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
    

Related words

• Antonyms: 
  improbability , improbableness