The quality of being bountiful, generous, and abundant in supply or giving.
From 'bountious' (variant of 'bountiful') plus the suffix '-ness.' This may be an archaic or variant form of 'bountifulness' with a slightly different pronunciation.
Some older texts use 'bountiousness' where we'd now say 'bountifulness'—it's a reminder that English once had more competing words before standardization settled on favorites.
Complete word intelligence in one call. Free tier — 50 lookups/day.