intromission

Meanings

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.

Etymology

From Medieval Latin intrōmissiō, intrōmissiōn- (“introduction, admission; usurpation”), intro- (“into”) + missiō (“sending”), from Latin intrōmissus (“sent in, introduced, let in, admitted”), perfect passive participle of intrōmittō (“send in, let in”).