probability

[prob-uh-bil-i-tee]
noun, plural probabilities.
1.
the quality or fact of being probable.
2.
a strong likelihood or chance of something: The probability of the book's success makes us optimistic.
3.
a probable event, circumstance, etc.: Our going to China is a probability.
4.
Statistics.
a.
the relative possibility that an event will occur, as expressed by the ratio of the number of actual occurrences to the total number of possible occurrences.
b.
the relative frequency with which an event occurs or is likely to occur.
Idioms
5.
in all probability, very probably; quite likely: The factory will in all probability be relocated.

Origin:
1545–55; < Latin probābilitās. See probable, -ity

nonprobability, noun, plural nonprobabilities.
superprobability, noun, plural superprobabilities.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To probabilities
Collins
World English Dictionary
probability (ˌprɒbəˈbɪlɪtɪ)
 
n , pl -ties
1.  the condition of being probable
2.  an event or other thing that is probable
3.  statistics a measure or estimate of the degree of confidence one may have in the occurrence of an event, measured on a scale from zero (impossibility) to one (certainty). It may be defined as the proportion of favourable outcomes to the total number of possibilities if these are indifferent (mathematical probability), or the proportion observed in a sample (empirical probability), or the limit of this as the sample size tends to infinity (relative frequency), or by more subjective criteria (subjective probability)

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
Cite This Source
Etymonline
Word Origin & History

probability
1550s; see probable + -ity.
Online Etymology Dictionary, © 2010 Douglas Harper
Cite This Source
American Heritage
Science Dictionary
probability   (prŏb'ə-bĭl'ĭ-tē)  Pronunciation Key 
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, or 1/6 .
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
Cite This Source
American Heritage
Cultural Dictionary

probability definition


A number between zero and one that shows how likely a certain event is. Usually, probability is expressed as a ratio: the number of experimental results that would produce the event divided by the number of experimental results considered possible. Thus, the probability of drawing the ten of clubs from an ordinary deck of cards is one in fifty-two (1:52), or one fifty-second.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
Cite This Source
Example sentences for probabilities
It is often used to compute posterior probabilities given observations.
This lemma is sometimes called the product rule for probabilities.
Copyright © 2014 Dictionary.com, LLC. All rights reserved.
  • Please Login or Sign Up to use the Recent Searches feature