Etymology

-osity

-o·si·ty

Today it means: Forming nouns, usually abstract, and usually from adjectives in -ous or -ose. Full definition →

Middle English -ouste ← Old French -ouseté ← Latin -ōsitās
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The story

  1. Latin · derived from-ōsitās
  2. Old French · derived from-ouseté
  3. Middle English · derived from-ouste
  4. English today-osity

From Middle English -ouste, from Old French -ouseté, from Latin -ōsitās; later modified to the current form. It is equivalent to -ose or -ous + -ity.

Etymology from Wiktionary, CC BY-SA 4.0.