1) Coin of ancient Rome 
The Sestertius, or Sesterce, (pl. sestertii) was an ancient Roman coin. During the Roman Republic it was a small, silver coin issued only on rare occasions. During the Roman Empire it was a large brass coin. The name Sestertius (originally semis-tertius) means `2 ½`, the coin`s original value in Asses, and is a combination of semis `half` an...
An ancient Roman coin; plural, sestertii.
(Latin) a silver coin that, during the time of the Republic, was valued at a two and a half denarii; later, the sestertius was made of copper and worth 4 denarii during the Imperial period.
A large Roman brass coin. Four times the value of an as. The plural is 'sestertii'.