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Webster 1913 Edition

Noun.

[L.

fabulositas

: cf. F.

fabulosité

Fabulousness.

[R.]

Abp. Abbot.

A fabulous or fictitious story.

[R.]

Sir T. Browne.

Noun.

Fabulousness; fullness of fables. [Little used.]

fabulosity ‎(countable and uncountable, plural fabulosities)

(uncountable) Fabulousness; the quality of being fabulous; fictitiousness; mythical character.
(obsolete, countable) A fabulous thing; a fable.

quality of being fabulous