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Webster 1913 Edition

Noun.

;

pl.

Improbabilities

(#)

[Cf. F.

improbabilité

The quality or state of being improbable; unlikelihood; also, that which is improbable; an improbable event or result.

Noun.

[See Improbable.] The quality of being improbable, or not likely to be true; unlikelihood.

improbability ‎(countable and uncountable, plural improbabilities)

unlikelihood

that which is improbable

improbability in The Century Dictionary, The Century Co., New York, 1911
improbability in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913