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 oneself To enter (a specified location or area) To enter into a zodiacal sign To manifest or cause to be manifested in the temporal world; to effect ingression
Immersion
Part of speech: noun
Definition: the act of immersing or the condition of being immersedthe total submerging of a person in water as an act of baptisman immersion heatera smooth map whose differential is everywhere injective, related to the mathematical concept of an embedding