Noun

(en noun)

The forcible inclusion or entry of an external group or individual; the act of intruding.

* He viewed sales calls as an unwelcome intrusion .

*{{quote-magazine, date=2012-12-14

, author=Simon Jenkins, authorlink=Simon Jenkins , title=We mustn't overreact to North Korea boys' toys , volume=188, issue=2, page=23 , date=2012-12-21 , magazine= citation , passage=The threat of terrorism to the British lies in the overreaction to it of British governments. Each one in turn clicks up the ratchet of surveillance, intrusion and security. Each one diminishes liberty.}}

(geology) Magma forced into other rock formations; the rock formed when such magma solidifies.

Noun

(en noun)

the state of being allowed to enter; admittance

the act of allowing to enter; admission

putting one thing into another; insertion

*1888 , , The Reverberator .

*:"Your father has told me all about it. Did you ever hear of anything so ridiculous?"

"All about what?—all about what?" said Delia, whose attempt to represent happy ignorance seemed likely to be spoiled by an intromission of ferocity. She might succeed in appearing ignorant, but she could scarcely succeed in appearing happy.

copulation: normally refers to the first moment of initial entry of a penis into a vagina, mouth or anus.

(legal, Scotland) An intermeddling with the affairs of another, either on legal grounds or without authority.