English to English

noun (n)

• 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(noun.attribute)

  Example:
  The probability that an unbiased coin will fall with the head up is 0.5.
  

  Synonym:
  chance
  

  source: wordnet30
• the quality of being probable; a probable event or the most probable event(noun.attribute)

  Example:
  For a while mutiny seemed a probability.
  Going by past experience there was a high probability that the visitors were lost.
  

  Antonym:
  improbability, improbableness
  

  source: wordnet30
• The quality or state of being probable; appearance of reality or truth; reasonable ground of presumption; likelihood.(noun)

  source: webster1913