From obvious +‎ -ity.

obviosity (countable and uncountable, plural obviosities)

1. The quality of being obvious.
2. That which is obvious.
   • 1893, Francis Henry Underwood, Quabbin: The Story of a Small Town with Outlooks Upon Puritan Life:

     These thoughts, in some pedant's phrase, are obviosities; and I bring them up only to show that our appreciation of form and color is something inevitable.

• obviousness