**probability** | | |

*n. (attribute)* | **1**. **chance**, **probability** | 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*" |

| ~ quantity, measure, amount | how much there is or how many there are of something that you can quantify. |

| ~ 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. |

| ~ exceedance | (geology) the probability that an earthquake will generate a level of ground motion that exceeds a specified reference level during a given exposure time.; "*the concept of exceedance can be applied to any type of environmental risk modeling*" |

| ~ 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 of exposure, risk | the probability of being exposed to an infectious agent. |

| ~ risk of infection, risk | the probability of becoming infected given that exposure to an infectious agent has occurred. |

*n. (attribute)* | **2**. **probability** | 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*" |

| ~ quality | an essential and distinguishing attribute of something or someone.; "*the quality of mercy is not strained*" |

| ~ likelihood, likeliness | the probability of a specified outcome. |

**probably** | | |

*adv. * | **1**. **belike**, **in all likelihood**, **in all probability**, **likely**, **probably** | with considerable certainty; without much doubt.; "*He is probably out of the country*"; "*in all likelihood we are headed for war*" |

*adv. * | **2**. **believably**, **credibly**, **plausibly**, **probably** | easy to believe on the basis of available evidence.; "*he talked plausibly before the committee*"; "*he will probably win the election*" |

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