- Statistics, Mathematics. the probability that an event will occur under the condition that another event occurs first: equal to the probability that both will occur divided by the probability that the first will occur.
Origin of conditional probability
First recorded in 1960–65
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
- statistics the probability of one event, A, occurring given that another, B, is already known to have occurred: written P (A|B) and equal to P (A and B)| P (B)