ingression

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[edit] English

ingression (plural ingressions)

The act or process of entering or intruding

ingression of the sea onto land
(metaphysics) The process by which a potentiality enters into actuality
- 1967, Whitehead's Metaphysics, Edward Pols^[1], page 164:
  
  […] it is by virtue of the individual essence that an eternal object remains precisely the same eternal object through all its ingressions […]
(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.