penetration

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penetration

1. Marketing the proportion of the total number of potential purchasers of a product or service who either are aware of its existence or actually buy it
2. another name for depth of field
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

penetration

[‚pen·ə′trā·shən]
(aerospace engineering)
That phase of the letdown from high altitude to a specified approach altitude.
(metallurgy)
The distance from the original surface of the base metal to that point at which weld fusion ends.
A surface defect on a casting caused by molten metal filling voids in the sand mold.
(ordnance)
Distance to which a projectile sinks into a target.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

penetration

1. The intersection of two vaulting surfaces.
2. The consistency of a bituminous material expressed as the distance (in hundredths of a centimeter) that a standard needle vertically penetrates a sample of the material under known conditions of loading, time, and temperature. Unless otherwise specified, the load, time, and temperature are understood to be 100 g, 5 sec, and 25°C (77°F), respectively.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.

penetration

penetrationclick for a larger image
i. That portion of a published high-altitude instrument approach procedure that prescribes a descent path from the fix on which the procedure is based to a fix or an altitude from which an approach to the airport is made.
ii. A flight into hostile airspace as in to penetrate enemy air defense. Also, the depth to which something penetrates, as in “When the Allied bombers increased their penetration into Germany.”
iii. The term also refers to weather penetration, which implies a flight deep into a cloud with vertical development or into the eye of a tropical revolving storm, as in “the aircraft penetrated the cumulonimbus clouds and came out unscathed.”
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved

penetration

The successful unauthorized breach of a security perimeter. See penetration test.
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References in periodicals archive ?
While this is the case in pure water, we understand now that UV penetration in natural waters is affected by dissolved organics and other factors, and that in many cases UV doesn't penetrate as deep as visible light, and may even be attenuated at depths of just a few inches to a few feet.
If you're standing in a brightly-lit room and no light penetrates from behind the mirror, all you see is your reflection.
This wire cage serves to ground the bath if metal penetrates through the crucible.
The investigators find that sperm lacking the protein fail to penetrate an egg's zona pellucida efficiently.
Such rays penetrate deep into the base layer of the skin, or dermis.
The slag begins to penetrate the refractory, while simultaneously destroying the integrity of the surface tension of the metal behind it.
Known as burn-on and burn-in, FeO and Si[O.sub.2] combine to form a fluid slag that easily penetrates the molding media, resulting in an iron oxide iron silicate phase on the casting surface.
This suggests a well-defined heliopause width, with lower-frequency radio bursts created earlier at the boundary's near, lower-density edge, and higher-frequency signals created later, when some of the solar wind penetrates deeper into the heliopause's denser parts.
Hallen and his co-workers have already used the microscope to study how the depth to which a magnetic field penetrates a superconductor corresponds to the size of the vortices seen on its surface at various temperatures.
An internal ground fault, on the other hand, occurs when the melt bath penetrates the refractory lining and touches the coil.
Two new studies now offer clues to the multi-step process whereby TCDD penetrates the nucleus of a cell and affects its genetic material.
Liquid Penetrant--Liquid penetrant inspection is a very sensitive process for locating surface defects in metals by the observance of highly visible liquid that penetrates exposed openings such as cracks, tears, pits, laps and into porous surfaces.