/ˌpenəˈtreɪʃn/
pene·tra·tion
BrE /ˌpenəˈtreɪʃn/
NAmE /ˌpenəˈtreɪʃn/
[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