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"
"if that phone call is for me, chances are it's my wife"
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"
The state of being probable; likelihood.
"The probability of finding a parking spot near the theater during rush hour is extremely low."
In plain English: Probability is how likely something is to happen.
"The probability of winning the lottery is extremely low."
Usage: Use probability to describe the mathematical likelihood that a specific event will occur or the general chance of something happening. It refers to how probable an outcome is, often expressed as a number between zero and one.
The word probability entered English from the Middle French term probabilité. It originally carried meanings of both likelihood and credibility before settling on its current sense.