The quality of being ascertainable; the degree to which something can be verified or determined with certainty.
From ascertainable with the suffix -ness (state or quality of). A 19th-century coining to express the abstract quality of ascertainability.
This is essentially a synonym for ascertainability, but 'ascertainableness' emphasizes the inherent characteristic while 'ascertainability' emphasizes the practical ability—a subtle distinction that rarely appears in modern English.
Complete word intelligence in one call. Free tier — 50 lookups/day.