n. [ Cf. F. intromission. See Intromit. ] [ 1913 Webster ]

1. The act of sending in or of putting in; insertion. [ 1913 Webster ]

2. Specifically; (Zool.) The insertion of the male copulatory organ into the female in the process of coitus. South. [ 1913 Webster +PJC ]

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) [ PJC ]

3. The act of letting go in; admission. [ 1913 Webster ]

4. (Scots Law) An intermeddling with the affairs of another, either on legal grounds or without authority. [ 1913 Webster ]