noun
( -s )
Etymology: Latin exsuperantia, exuperantia, from exsuperant-, exsuperans, exuperant-, exuperans (present participle of exsuperare, exuperare to excel, surpass, from ex- ex- (I) + superare to rise above, surmount exceed, excel, surpass) + -ia -y — more at superable
obsolete : the amount by which one thing exceeds another ; also : superabundance