IMPROBABILITY
improbability, improbableness
(noun) the quality of being improbable; “impossibility should never be confused with improbability”; “the improbability of such rare coincidences”
Source: WordNet® 3.1
Etymology
Noun
improbability (countable and uncountable, plural improbabilities)
The quality or state of being improbable; unlikelihood.
That which is improbable; an improbable event or result.
Source: Wiktionary
Im*prob`a*bil"i*ty, n.; pl. Improbabilities. Etym: [Cf. F.
improbabilité.]
Definition: The quality or state of being improbable; unlikelihood; also,
that which is improbable; an improbable event or result.
Source: Webster’s Unabridged Dictionary 1913 Edition