Noun

(en noun)

The act of penetrating something.

Any penetration , however slight, is sufficient to complete the offense.

Specifically, the insertion of the penis (or similar object) during sexual intercourse.

The act of penetrating a given situation with the mind or faculties; perception, discernment.

* 1817 , (Walter Scott), Rob Roy , XVI:

my observations of her looks and actions became acutely sharpened, and that to a degree which, notwithstanding my efforts to conceal it, could not escape her penetration .

A number or fraction that represents how many cards/decks will be dealt before shuffling, in contrast to the total number of cards/decks in play.

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.