What is "penetration"

Penetration \Pen"e*tra`tion\, n. [L. penetratio: cf. F. p['e]n['e]tration.]

1. The act or process of penetrating, piercing, or entering; also, the act of mentally penetrating into, or comprehending, anything difficult.

   And to each in ward part, With gentle penetration, though unseen, Shoots invisible virtue even to the deep.
   --Milton.

   A penetration into the difficulties of algebra.
   --Watts.

2. Acuteness; insight; sharp discoverment; sagacity; as, a person of singular penetration.
   --Walpole.

   Syn: Discernment; sagacity; acuteness; sharpness; discrimination. See Discernment, and Sagacity.

c.1600, "insight, shrewdness," from Latin penetrationem (nominative penetratio) "a penetrating or piercing," noun of action from past participle stem of penetrare (see penetrate). The sexual sense is attested from 1610s.

n. 1 The act of penetrate something. (from 15th c.) 2 Specifically, the insertion of the penis (or similar object) during sexual intercourse. (from 17th c.) 3 The act of penetrating a given situation with the mind or faculties; perception, discernment. (from 17th c.) 4 (cx blackjack English) 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.

1. n. an attack that penetrates into enemy territory [syn: incursion]

2. clear or deep perception of a situation [syn: insight]

3. the act of entering into or through something; "the penetration of upper management by women"

4. the ability to make way into or through something; "the greater penetration of the new projectiles will result in greater injuries"

5. the depth to which something penetrates (especially the depth reached by a projectile that hits a target)

6. the act (by a man) of inserting his penis into the vagina of a woman

Penetration may refer to:

• Market penetration or brand penetration, the degree to which a product or service is known and/or used
• Penetration depth of light or any electromagnetic radiation.
• Penetration (telecommunications)
• Penetrating trauma
• Penetration (warfare)
• Penetration (weapons), the ability to pierce the target's armor or other protection
• Penetration (firestop), an opening in a wall or floor assembly required to have a fire-resistance rating, for the purpose of accommodating the passage of a mechanical, electrical, or structural penetrant
• In roofing, pipes, conduits, HVAC supports passing through the roof
• In basketball, the ability of a player to drive through the opposition's defense
• In magic, an illusion in which one object appears to pass through another
• Sexual penetration, a term which may mean sexual intercourse in general or,
  • in some jurisdictions, a criminal charge related to various sexual offences

In popular culture

• Penetration (artistic), an artistic strategy
• Penetration (band), a punk rock band
• "Penetration", a song on Iggy and the Stooges' album Raw Power
• "Penetration", a song on Pedro the Lion's album Control
• "Penetration", a song by The Pyramids
• Body of Lies (film), a film formerly known as Penetration

Strictly speaking, penetration occurs when a projectile enters a target without passing through it and perforation occurs when the projectile completely passes through the target, but the word penetration is commonly used to refer to either.

Penetration into a semi-infinite or massive target is penetration (in the strict sense of the word) of targets so thick that the level of penetration is not affected by the target's thickness. There is a transition region between semi-infinite penetration and perforation, in which the target is not perforated but the projectile, as it nears the back face of the target, meets reduced resistance and is capable of penetrating a greater distance than it would in a semi-infinite target. This effect is variously named the back or rear surface, plate, or face effect and is also present when perforation occurs.

A penetrating projectile may cause the target to break into multiple pieces, spewing from both the front and back of the target, themselves at high velocity. These pieces are collectively referred to as spall. Spall can be generated even if a perforation is not achieved (the projectile fails to pass through the target), generated instead by the shock wave generated by the impact of the projectile.

Bombs designed for great penetration into the earth or for perforation of hardened targets are known as bunker busters.

Category:Ballistics

In telecommunication, the term penetration has the following meanings:

1. The passage through a partition or wall of an equipment or enclosure by a wire, cable, or other electrically conductive object.
2. The unauthorized act of bypassing the security mechanisms of a cryptographic system or AIS.
3. The passage of a radio frequency through a physical barrier, such as a partition, a wall, a building, or earth.

Penetration is a punk rock band from County Durham, England formed in 1976. They re-formed in 2001 with several new members.

Their debut single, "Don't Dictate", is now acknowledged as a classic punk rock single and their debut album, Moving Targets (1978), is still widely admired.

In ground warfare, penetration is the breaching of, and moving past, a defensive military line.

Penetration is a strategic military maneuver much like the pincer movement with a few differences. The penetration attack goes straight through the enemy's lines and, once through, each flank turns and attacks the opponent's rear, similar to the blitzkrieg strategy.

The penetration is carried out as part of a frontal attack when there is no assailable flank available. It takes the form of assaulting the enemy positions, creating a rupture, widening of the gap and finally breakthrough. Separate forces are earmarked for the assault and break-out stages of penetration. Penetration has the stages of break in, dog fight and break-out. There are no clear-cut demarcations between these stages and these tend to overlap.

Flank attack and other forms of maneuver are preferred to the penetration or frontal attack.

A penetration, in firestopping, is an opening, such as one created by the use of a cast-in-place sleeve, in a wall or floor assembly required to have a fire-resistance rating, for the purpose of accommodating the passage of a mechanical, electrical or structural penetrant. The penetration may or may not contain a firestop system. A penetration is not a penetrant. A penetration may or may not include a penetrant.