immissĭo (inm-), ōnis, f. [immitto],
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.
immissiō (inm-) ōnis, f inmitto, a letting grow, letting alone : sarmentorum. ...
An Elementary Latin Dictionary