Definition of penetration noun from the Oxford Advanced Learner's Dictionary

     

    penetration

     noun
    noun
    BrE BrE//ˌpenəˈtreɪʃn//
     
    ; NAmE NAmE//ˌpenəˈtreɪʃn//
     
    [uncountable]
     
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  1. 1the act or process of making a way into or through something The floor is sealed to prevent water penetration. the company’s successful penetration of overseas markets Our aim is to achieve greater market penetration. The country has the highest cell phone penetration in Europe.
  2. 2the act of a man putting his penis into his partner’s vagina or anus
  3. Word Origin late Middle English: from Latin penetratio(n-), from the verb penetrare ‘place within or enter’.
See the Oxford Advanced American Dictionary entry: penetration