The Collaborative International Dictionary
Betterness
Betterness \Bet"ter*ness\, n.
The quality of being better or superior; superiority. [R.]
--Sir P. Sidney.The difference by which fine gold or silver exceeds in fineness the standard.
Wiktionary
betterness
n. 1 (context uncountable English) The state or quality of being better; superiority. 2 (context countable English) The result or product of being better. 3 (context minting English) The amount by which a precious metal exceeds the the standard of fineness.
Usage examples of "betterness".
Everything in Faery is better by this one wonderful degree, and it is by this betterness you will know that you are there if you should ever happen to get there.
Poor Leola did not get better and better because she had no idea of what betterness was.