#1 penetration n. [incursion] an attack that penetrates into enemy territory. wn
#2 penetration n. [insight] clear or deep perception of a situation. wn
#3 penetration n. the act of entering into or through something; "the penetration of upper management by women". wn
#4 penetration n. the ability to make way into or through something; "the greater penetration of the new projectiles will result in greater injuries". wn
#5 penetration n. the depth to which something penetrates (especially the depth reached by a projectile that hits a target). wn
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