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Noun: ingress  'in,gres
  1. (astronomy) the disappearance of a celestial body prior to an eclipse
    - immersion
  2. The act of entering
    "she made a grand ingress";
    - entrance, entering, entry, incoming

Derived forms: ingresses

Type of: arrival, disappearance

Antonym: emersion

Part of: eclipse, occultation

Encyclopedia: Ingress, egress, and regress