The quality or state of having been begotten or produced; the condition of being born or created.
From begotten (past participle of beget) + -ness (suffix forming abstract nouns from adjectives). A formal, philosophical term rarely used in modern English.
Creating abstract nouns with -ness is so productive in English that speakers can potentially turn almost any adjective into a noun—'begottenness' is obscure, but it shows how this pattern allowed philosophers and theologians to discuss abstract concepts like the state of having been created.
Complete word intelligence in one call. Free tier — 50 lookups/day.