"penetration" in the noun sense
1. penetration, incursion
an attack that penetrates into enemy territory
2. penetration, insight
clear or deep perception of a situation
3. penetration
the act of entering into or through something
"the penetration of upper management by women"
4. penetration
the ability to make way into or through something
"the greater penetration of the new projectiles will result in greater injuries"
5. penetration
the depth to which something penetrates (especially the depth reached by a projectile that hits a target)
6. penetration
the act (by a man) of inserting his penis into the vagina of a woman
Source: WordNet® (An amazing lexical database of English)
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