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say it: pen-uh-TRAY-shuhn
penetration is a noun meaning "an attack that penetrates into enemy territory". It carries 6 recorded senses.
an attack that penetrates into enemy territory
clear or deep perception of a situation
the act of entering into or through something
“the penetration of upper management by women”
the ability to make way into or through something
“the greater penetration of the new projectiles will result in greater injuries”
the depth to which something penetrates (especially the depth reached by a projectile that hits a target)
the act (by a man) of inserting his penis into the vagina of a woman
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for penetration come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.