Immersion
Part of speech: noun
Definition: the act of immersing or the condition of being immersed the total submerging of a person in water as an act of baptism an immersion heater a smooth map whose differential is everywhere injective, related to the mathematical concept of an embedding
Ingress
Part of speech: noun
Definition: The act of entering.Permission to enter.A door or other means of entering.
Part of speech: verb
Definition: To intrude or insert oneselfTo enter (a specified location or area)To enter into a zodiacal signTo manifest or cause to be manifested in the temporal world; to effect ingression