-osity

Etymology
From, from , from ; later modified to the current form. It is equivalent to or  +.

Suffix

 * 1) Forming nouns, usually abstract, and usually from adjectives in -ous or -ose.
 * 2)  Forming nouns from other adjectives for humorous effect.

Usage notes
Rarely productive in English outside of humorous use – primarily found in borrowings from Latin, often via French.

Derived terms