What does probability mean?

Definitions for probability
ˌprɒb əˈbɪl ɪ tiprob·a·bil·i·ty

Here are all the possible meanings and translations of the word probability.

Princeton's WordNet

  1. probability, chancenoun

    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"

  2. probabilitynoun

    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"


  1. probabilitynoun

    the state of being probable; likelihood

  2. probabilitynoun

    an event that is likely to occur

  3. probabilitynoun

    the relative likelihood of an event happening

  4. probabilitynoun

    a number, between 0 and 1, expressing the precise likelihood of an event happening

  5. Etymology: From probabilitas, from probabilis; see probable.

Samuel Johnson's Dictionary

  1. Probabilitynoun

    Likelihood; appearance of truth; evidence arising from the preponderation of argument: it is less than moral certainty.

    Etymology: probabilitas, Lat. probabilité, Fr. from probable.

    Probability is the appearance of the agreement or disagreement of two ideas, by the intervention of proofs, whose connection is not constant; but appears for the most part to be so. John Locke.

    As for probabilities, what thing was there ever set down so agreeable with sound reason, but some probable shew against it might be made? Richard Hooker, Preface.

    If a truth be certain, and thwart interest, it will quickly fetch it down to but a probability; nay, if it does not carry with it an impregnable evidence, it will go near to debase it to a downright falsity. Robert South, Sermons.

    Though moral certainty be sometimes taken for a high degree of probability, which can only produce a doubtful assent; yet it is also frequently used for a firm assent to a thing upon such grounds, as are fit fully to satisfy a prudent man. John Tillotson, Sermons.

    For a perpetual motion, magnetical virtues are not without some strong probabilities of proving effectual. John Wilkins.

Webster Dictionary

  1. Probabilitynoun

    the quality or state of being probable; appearance of reality or truth; reasonable ground of presumption; likelihood

  2. Probabilitynoun

    that which is or appears probable; anything that has the appearance of reality or truth

  3. Probabilitynoun

    likelihood of the occurrence of any event in the doctrine of chances, or the ratio of the number of favorable chances to the whole number of chances, favorable and unfavorable. See 1st Chance, n., 5


  1. Probability

    Probability is a measure or estimation of how likely it is that something will happen or that a statement is true. Probabilities are given a value between 0 and 1. The higher the degree of probability, the more likely the event is to happen, or, in a longer series of samples, the greater the number of times such event is expected to happen. These concepts have been given an axiomatic mathematical derivation in probability theory, which is used widely in such areas of study as mathematics, statistics, finance, gambling, science, artificial intelligence/machine learning and philosophy to, for example, draw inferences about the expected frequency of events. Probability theory is also used to describe the underlying mechanics and regularities of complex systems.

U.S. National Library of Medicine

  1. Probability

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

Suggested Resources

  1. probability

    The probability symbol -- In this Symbols.com article you will learn about the meaning of the probability symbol and its characteristic.

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British National Corpus

  1. Nouns Frequency

    Rank popularity for the word 'probability' in Nouns Frequency: #1885

How to pronounce probability?

How to say probability in sign language?


  1. Chaldean Numerology

    The numerical value of probability in Chaldean Numerology is: 5

  2. Pythagorean Numerology

    The numerical value of probability in Pythagorean Numerology is: 3

Examples of probability in a Sentence

  1. Marco Valli:

    The ECB's move increases the probability of the Fed thinking twice about it, they will want to give the impression that they remain on track to raise rates at the end of the year.

  2. Lakshheish M Patel:

    Since Reliance share had gone up for the first 45 minutes and then dropped down, the probability is quite high that the entire share market will close at the lowest level. Because stock market never wants its traders to make money and be cheerful

  3. Nikhil Batra:

    The NDAA is not really a reversal of the ZTE deal, but will in all probability prolong the ban-lifting process for ZTE.

  4. Jared Woodard:

    All the evidence suggests folks who were inclined to hedge against this kind of scenario have been doing so for some time and that reduces the probability of a panic washout.

  5. Laurie Schalow:

    We have been unable to adequately staff this remote restaurant with crew and continue to be plagued with excessive call-outs and lack of availability from existing staff, because of these ongoing staffing challenges, there is no probability of reopening in the foreseeable future, so we've made the decision to permanently close the restaurant.

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Translations for probability

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