C1 the level of possibility of something happening or being true: What is the probability of winning? The probability of getting all the answers correct is about one in ten. There's a high/strong probability (that) (= it is very likely that) she'll be here. Until yesterday, the project was just a possibility, but now it has become a real probability (= it is likely to happen). in all probability C2 used to mean that something is very likely: She will, in all probability, have left before we arrive.

**Synonym**

Thesaurus

Possible and probable

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