The act of coming in
arrival, entry, ingress, incoming, ingoing, ingression, access, admission, admittance, entree, appearance, coming, passage, approach, progress, induction, initiation, introduction, inception, baptism, accession, import, importation, penetration, trespass, debut, enrollment, enlistment, registering, invasion, immigration.
Antonyms escape*, exit, issue.
A place for entering
gate, door, doorway, entry, inlet, gateway, portal, porch, portico, opening, passage, vestibule, lobby, foyer, staircase, hall, hallway, archway, ingress, path, way, entranceway, entryway, passageway, threshold, corridor, approach, stoop, aperture, hole, gape, port, gorge, adit, propylaeum.
Antonyms exit*, mouth, outlet.