Actus
A Roman measure of length. It formed the basis of the whole system of land measurement. The
actus simplex or
minimus was 120 (Roman) feet long
and four feet wide. The
actus quadratus was a square of 120 feet each
way=14,400 square feet (Pliny ,
Pliny H. N. xviii.
9). The actus is an example of the combination of the decimal with the duodecimal
system, its length being twelve times the standard
decempeda (q. v.). The
actus was half the
iugerum. In Hispania Baetica, the
actus
quadratus was called
acna (also written
agna,
and
agnua). Cf. Varro,
R. R. i. 10.2.