sestertiûm

Updated: July 27, 2026

I know, indeed, which is most conformable to the rules of grammar: but yet I sometimes express myself as the freedom of our language allows me, as when I say at pleasure, either prob deum, or prob deorum; and, at other times, as I am obliged by custom, as when I say trium virum for virorum, or sestertium nummum for nummorum: because in the latter case the mode of expression is invariable.

Marcus Tullius Cicero - Cicero's Brutus or History of Famous Orators; also His Orator, or Accomplished Speaker.