probability meaning

[ ˌprɔbə'biliti ] Pronunciation:   "probability" in a sentence
Noun: probability  `próbu'bilitee
  1. A measure of how likely it is that some event will occur; a number expressing the ratio of favourable cases to the whole number of cases possible
    "the probability that an unbiased coin will fall with the head up is 0.5"
    - chance 
  2. 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"

Derived forms: probabilities

See also: probabilistic, probable

Type of: amount, measure, quality, quantity

Antonym: improbability

Encyclopedia: Probability

The likelihood that an event or a particular result will occur. It can be represented on a scale by a number between 0 (zero probability of the event happening, i.e. it is certain not to) and 1 (certainty that it will occur). It is treated mathematically on this basis in statistics.

1. The branch of mathematics concerned with the likelihood of an event’s occurrence. It has many applications in quality control and physics.
2. The mathematical likelihood that an event will occur.

The relative likelihood of a particular outcome among all possible outcomes.

The study of chance processes or the relative frequency characterizing a chance process.


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  1. what is the probability that it is a prime?
  2. a higher probability means more confidence.
  3. a probability of 1 represents certainty.
  4. this is often quoted above of 67% probability.
  5. in all probability he is already left.

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