Longman Dictionary of Contemporary English homepage

probability

 noun
     
Related topics: Maths
prob‧a‧bil‧i‧ty
1 [uncountable and countable] how likely something is, sometimes calculated in a mathematical way [= likelihood, chance]
the probability of (doing) something
The probability of winning the lottery is really very low.
There's a high probability that the children will follow a different career.
probability that
There is a 95% probability that she will not have the disease.
You must decide whether, on the balance of probabilities, he committed the crime.
2 [singular] what is likely or something that is likely:
The probability is that smaller businesses will not have to pay the tax.
A peace agreement now seems a probability rather than a possibility.
high/strong probability
projects that have a high probability of making profits
3

in all probability

very probably:
Mistakes could and, in all probability, would occur.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
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