INTROMISSION
insertion, introduction, intromission
(noun) the act of putting one thing into another
Source: WordNet® 3.1
Etymology
Noun
intromission (countable and uncountable, plural intromissions)
the state of being allowed to enter; admittance
the act of allowing to enter; admission
putting one thing into another; insertion
copulation: normally refers to the first moment of initial entry of a penis into a vagina, mouth or anus.
(legal, Scotland) An intermeddling with the affairs of another, either on legal grounds or without authority.
Source: Wiktionary
In`tro*mis"sion, n. Etym: [Cf. F. intromission. See Intromit.]
1. The act of sending in or of putting in; insertion. South.
2. The act of letting go in; admission.
3. (Scots Law)
Definition: An intermeddling with the affairs of another, either on legal
grounds or without authority.
Source: Webster’s Unabridged Dictionary 1913 Edition