# Probability definition

prŏbə-bĭlĭ-tē
Frequency:
The quality or state of being probable; likelihood.
noun
(math.) The ratio of the number of times something will probably occur to the total number of possible occurrences.
noun
A number expressing the likelihood of the occurrence of a given event, especially a fraction expressing how many times the event will happen in a given number of tests or experiments. For example, when rolling a six-sided die, the probability of rolling a particular side is 1 in 6, or1 /6 .
Probability is defined as the likelihood of something occurring or the chance of something happening.

When there is a 50 percent chance of something, this is an example of a time when the event has a probability of 50 percent.

When there are gray clouds in the sky, this is an example of a time when there is a high probability of rain.

noun
The quality or condition of being probable; likelihood.
noun
The likelihood that a given event will occur.

Little probability of rain tonight.

noun
(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.
noun
Something probable.
noun
The state of being probable; likelihood.
noun
An event that is likely to occur.
noun
The relative likelihood of an event happening.
noun
(mathematics) A number, between 0 and 1, expressing the precise likelihood of an event happening.
noun
A probable situation, condition, or event.

Her election is a clear probability.

noun
in all probability
• Most probably; very likely.
idiom
in all probability
• very likely
idiom

Singular:
probability
Plural:
probabilities

## Origin of probability

• From Latin probabilitas (“probability, credibility"), from probabilis (“probable, credible"); see probable.