The probability that an event will occur given that one or more other events have occurred WordNet 3.0 & Open English WordNet

In probability theory, conditional probability is a measure of the probability of an event occurring, given that another event is already known to have occurred. Wikipedia

The probability of an event A given that another event B has occurred Wikipedia Disambiguation

Measure of likelihood of an event when another event is known to have occurred Wikidata

The probability that an event will take place given the restrictive assumption that another event has taken place, or that a combination of other events has taken place. (Mathematically, the definition would be that the conditional probability of B given A is equal to the joint probability of A and B divided by the probability of A.). Wiktionary

Probability. Wiktionary (translation)