- In <em>Roman antiquity</em>, a copper (or, strictly, bronze) coin, the fourth part of the as.
- A fourth part of the coin called an as. See 3d As, 2.
- The fourth of a penny; a farthing. See <er>Cur</er>.
- A bronze coin of the Roman republic worth one <xref>quarter</xref> of an <xref>as</xref>.