English to English
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
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
3. The quality or state of being probable; appearance of reality or truth; reasonable ground of presumption; likelihood.