Probability has to do with how likely something is to happen. If there's a 50/50 chance, then the probability is 50%.

Probability is a part of math involving percentages and chance. The probability of a thing happening is the same as the odds or chances of something happening. When you watch a weather forecast, it might say there's a 30% chance of showers; that's probability. Gambling — on sports or something else — is also based on probability. Since most things in life are uncertain, it's helpful to know if the probability is high or low for things you want to do or try.

Definitions of probability

n a measure of how likely it is that some event will occur; a number expressing the ratio of favorable cases to the whole number of cases possible

“the probability that an unbiased coin will fall with the head up is 0.5”
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conditional probability, contingent probability
the probability that an event will occur given that one or more other events have occurred
cross section
(physics) the probability that a particular interaction (as capture or ionization) will take place between particles; measured in barns
(geology) the probability that an earthquake will generate a level of ground motion that exceeds a specified reference level during a given exposure time
fair chance, sporting chance
a reasonable probability of success
fat chance, slim chance
little or no chance of success
joint probability
the probability of two events occurring together
risk, risk of exposure
the probability of being exposed to an infectious agent
risk, risk of infection
the probability of becoming infected given that exposure to an infectious agent has occurred
Type of:
amount, measure, quantity
how much there is or how many there are of something that you can quantify

n the quality of being probable; a probable event or the most probable event

“for a while mutiny seemed a probability
“going by past experience there was a high probability that the visitors were lost”
improbability, improbableness
the quality of being improbable
likelihood, likeliness
the probability of a specified outcome
the likelihood of a thing occurring rather than not occurring
Type of:
an essential and distinguishing attribute of something or someone

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