PROBABILITY
probability
(noun) 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”
probability, chance
(noun) 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”; “if that phone call is for me, chances are it’s my wife”
Source: WordNet® 3.1
Etymology
Noun
probability (plural probabilities)
The state of being probable; likelihood.
An event that is likely to occur.
The relative likelihood of an event happening.
(mathematics) A number, between 0 and 1, expressing the precise likelihood of an event happening.
Source: Wiktionary
Prob`a*bil"i*ty, n.; pl. Probabilities. Etym: [L. probabilitas: cf.
F. probabilité.]
1. The quality or state of being probable; appearance of reality or
truth; reasonable ground of presumption; likelihood.
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. Locke.
2. That which is or appears probable; anything that has the
appearance of reality or truth.
The whole life of man is a perpetual comparison of evidence and
balancing of probabilities. Buckminster.
We do not call for evidence till antecedent probabilities fail. J. H.
Newman.
3. (Math.)
Definition: 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.
Syn.
– Likeliness; credibleness; likelihood; chance.
Source: Webster’s Unabridged Dictionary 1913 Edition