in ancient architecture, a measure in length equal to 120 Roman feet. In ancient agriculture, the word signified the length of one furrow, or the distance a plough goes before it turns.

Actus Minimus, was a quantity of land 120 feet in length, and four in breadth.

Actus Major, or Actus Quadratus, a piece of ground in a square form, whose side was equal to 120 feet, equal to half the jugerum.

Actus Intercanalis, a space of ground four feet in breadth, left between the lands as a path or way.