I / immissĭo
noun

immissĭo

gen. immissōnis · gender feminine · decl. 3rd
a letting in; admission
a letting in, admission (rare but class.): fumi aut aquae, Dig. 8, 5, 8, § 5: sarmentorum ea aliorum amputatio, aliorum inmissio, an engrafting, Cic. de Sen. 15, 53.