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penetration /ˌpɛnəˈtreɪʃən/  

  • noun
    plural -tions
    the act of going through or into something :the act of penetrating something [noncount]
    Cuts in the skin could permit the penetration of bacteria into the body.
    the penetration of the CIA by foreign agents
    the penetration of the U.Smarket by a foreign company [count]
    [noncount] formal :an ability to understand things clearly and fully