Noun
1. an attack that penetrates into enemy territory
2. clear or deep perception of a situation
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