Intromission /(?)/

In·tro·mis·sion

Intromission

n.
  1. The act of sending in or of putting in; insertion.
  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. The act of letting go in; admission.
  4. An intermeddling with the affairs of another, either on legal grounds or without authority. (Scots Law)