-osity

a suffix forming nouns from adjectives ending in -ose or -ous, such as verbosity from verbose and pomposity from pompous.

Origin of -osity

From Old French -osité, from Latin -ōsitātem, inflectional stem of -ōsitās, suffix forming nouns from adjectives ending in -ōsus; -ose¹

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

But in his talk there were no pompous triads, and little more than a fair proportion of words in -osity and -ation.
Encyclopaedia Britannica, 11th Edition, Volume 15, Slice 4 | Various
See the nat'ral cur'osity as is to start a religion shop, an' grind us fellers inter angels.
The Angel of the Gila: | Cora Marsland
So there's one cur'osity the less; not that I'm glad of it, for not knowin' worries more than knowin', whatsoever and whosoever.
The Story Of Kennett | Bayard Taylor
It is easy to jest at words in -osity and -ation, as 'dictionary' words, and the like.
The Art of Public Speaking | Dale Carnagey (AKA Dale Carnegie) and J. Berg Esenwein
But in his talk there were no pompous triads, and little more than a fair proportion of words in osity and ation.
Macaulay's Life of Samuel Johnson | Thomas Babington Macaulay

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