English

Noun

ingression ‎(plural ingressions)

1. The act or process of entering or intruding

   ingression of the sea onto land

2. (metaphysics) The process by which a potentiality enters into actuality
   • 1967, Whitehead's Metaphysics, Edward Pols, page 164:

     […] it is by virtue of the individual essence that an eternal object remains precisely the same eternal object through all its ingressions […]

3. (biology) The inward migration of cells from the blastula during gastrulation
   • 1940, Libbie Henrietta Hyman, The Invertebrates, page 496:

     Ingression of ectodermal cells from the area between the velar lobes establishes the cerebral ganglia and similar ingressions produce the other ganglia.

Related terms

• ingressive
• ingressor
• aggression
• egression
• progression
• transgression