Definition of "ingression" [in•gres•sion]

• The act or process of entering or intruding (noun)
• The process by which a potentiality enters into actuality (noun)
• The inward migration of cells from the blastula during gastrulation (noun)

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• "Now our first impression is that at last we have come to the simple plain fact of where the object really is; and that the vaguer relation which I call ingression should not be muddled up with the relation of situation, as if including it as a particular case."
• "You may have noticed that I am using the term 'ingression' to denote the general relation of objects to events."
• "It paints woman as passive participant in the sexual act, where that participation amounts only to accepting the invasive ingression upon her core."