(ˈ)i|mishən noun
Etymology: Latin immission-, immissio, from immissus past participle of immittere to send in (from in- in- (II) + mittere to send) + -ion-, -io -ion — more at smite
1.
a. archaic : an act of sending or letting in : injection , admission , introduction
b. obsolete : something introduced
2. : commixture 2