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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.

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    • Pliny the Elder, Naturalis Historia, 18.9
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