Meaning of PENETRATION in English
/ ˌpenɪˈtreɪʃn; NAmE / noun [ U ]
the act or process of making a way into or through sth :
The floor is sealed to prevent water penetration.
the company's successful penetration of overseas markets
the act of a man putting his penis into his partner's vagina or anus
late Middle English : from Latin penetratio(n-) , from the verb penetrare place within or enter.
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005