The Penetration reference article from the English Wikipedia on 24-Apr-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Penetration

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 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. Source: from Federal Standard 1037C and from MIL-STD-188 and from the National Information Systems Security Glossary

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In business, penetration is often short for market penetration, the degree to which a product or service is known and/or used among potential customers.

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Sexual penetration (as opposed to outercourse):

• sexual intercourse
• fellatio
• anal sex
• sexual penetration with a finger or object

A kind of semi- or pseudo-penetration is inter-crural intercourse.

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