penetration
🇺🇸
/ˌpenəˈtreɪʃn/
🇬🇧
/ˌpenəˈtreɪʃn/
going into or through something
The new product aims for better market penetration.
新製品はより良い市場浸透を目指しています。
putting the penis into a partner's body opening
Penetration is one form of sexual activity.
挿入は性行為の一形態です。