n. pl. prob·a·bil·i·ties 1. The quality or condition of being probable; likelihood.
2. A probable situation, condition, or event: Her election is a clear probability.
3. a. The likelihood that a given event will occur: little probability of rain tonight.
b. Statistics A number, ranging from zero to one, expressing either the projected likelihood that a specific event will occur or the observed ratio of the number of actual occurrences to the number of possible occurrences.