ingression

English

Etymology tree

English ingress

Proto-Indo-European *-tis

Proto-Indo-European *-Hō

Proto-Indo-European *-tiHō

Proto-Italic *-tiō

Latin -tiō

Latin -ātiōlbor.

Old French -ationbor.

Middle English -acioun

English -ation

English -ion

English ingression

From ingress + -ion.

ingression (countable and uncountable, 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.