intromission
/ˌɪn.tɹəˈmɪʃ.ən/noun
University
1
The state of being allowed to enter; admittance
2
The act of allowing to enter; admission
3
Putting one thing into another; introduction (into); insertion
4
Copulation: usually the first moment of initial entry of a penis into a vagina, mouth or anus.
5
An intermeddling with the affairs of another, either on legal grounds or without authority.