This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

n. The act or process of entering or intruding

n. The process by which a potentiality enters into actuality

n. The inward migration of cells from the blastula during gastrulation

n. Act of entering; entrance.

n. The act of entering, as into union or incorporation with something; a passing into or within.

"It paints woman as passive participant in the sexual act, where that participation amounts only to accepting the invasive ingression upon her core."

ingressor    ingressive    aggression    transgression    progression   

entrance