What does cautum mean in Latin?

cautum, a noun, means “provisions (of a law); a decree; protected territory, district subject to an immunity”.

What is the genitive of cautum?

The genitive singular is cautī. cautum is neuter, second declension.

In classical Latin, [ˈkau̯.tũː]; in ecclesiastical (church) Latin, [ˈkaːu̯.tum].

noun · neutersecond declension

cautum n (genitive cautī)

Classical[ˈkau̯.tũː]Ecclesiastical[ˈkaːu̯.tum]

in pluralneuterprovisions (of a law)
neutera decree
[...]; nam cum multiplici undique familia conparata inimicos exterruisset, cautum est de numero gladiatorum, quo ne maiorem cuiquam habere Romae liceret.…; for he (Caesar) had finally mustered such a great host of them from all parts; of which, his enemies being in great fear, made the senate rule by decree the number of gladiators one might keep beside him in Rome.c. 69 CE – 122 CE, Suetonius, De Vita Caesarum 1 10
Medieval Latinneuterprotected territory, district subject to an immunity

Substantivisation of cautus (“protected, guaranteed, stipulated”), past participle of caveō.