The quality or state of being autochthonous; the condition of being native to or originating in a particular place.
The abstract noun form created by adding -ness to autochthonous. This suffix converts the adjective into a noun representing the abstract quality or condition.
English lets us pile on suffixes to create increasingly abstract concepts: autochthon (person) → autochthonous (adjective) → autochthonousness (the abstract concept). Each layer removes us further from a concrete thing and closer to a philosophical idea.
Complete word intelligence in one call. Free tier — 50 lookups/day.