D defs.my
Entry 4 senses Webster, 1913

Intromission

/ĭn′trə-mĭsh′ən/ · In·tro·mis·sion · IPA /ˌɪn.tɹəˈmɪʃ.ən/
01 n. The act of sending in or of putting in; insertion.
  1. 1.
    The act of sending in or of putting in; insertion.
  2. 2.
    The insertion of the male copulatory organ into the female in the process of coitus.(Zool.)
    “Four populations [of the vlei rat] varied in a number of parameters of copulatory behavior, such as latency to first mount, number of intromissions per series, and latency to intromission after first ejaculation.” — Edith Dempster (African Small Mammals Newsletter, Issue No. 16, May 1996, Laboratoir Mammifères & Oiseaux, Paris)
  3. 3.
    The act of letting go in; admission.
  4. 4.
    An intermeddling with the affairs of another, either on legal grounds or without authority.(Scots Law)