The quality of being defensible or capable of being defended.
From defensible + -ness (English suffix creating abstract nouns from adjectives). This is a more emphatic or formal variation of defensibility, using Old English-derived suffix -ness rather than Latin-derived -ity.
English gives us two ways to say almost the same thing: defensibility and defensibleness. The -ness version feels more concrete and Anglo-Saxon, while -ity sounds more formal and Latinate—language lets us pick our tone.
Complete word intelligence in one call. Free tier — 50 lookups/day.