What does "overplus" mean?

That which remains beyond what is necessary or required; a surplus.

What is a synonym for "overplus"?

Common synonyms include: superfluity, balance, bonus, dividend, embarrassment, excess.

/ˈəʊvəplʌs/ noun

noun ·Uncommon ·Advanced level

Noun

1
That which remains beyond what is necessary or required; a surplus. countable, uncountable
"Where some for an over-plus, or supererogation have added this necessaity, that they must necessarily accompany them, as well in death, as in life."
2
extreme excess wordnet

"Where some for an over-plus, or supererogation have added this necessaity, that they must necessarily accompany them, as well in death, as in life."

From over- + Anglo-Norman plus, Middle French plus.