1. (n.) The act of sending in or of putting in; insertion.

2. (n.) The act of letting go in; admission.

3. (n.) An intermeddling with the affairs of another, either on legal grounds or without authority.

acceptance admission admittance baptism embedment enlistment enrollment entrance graft grafting immission impaction impactment implantation inauguration induction infixion infusion initiation injection inoculation insertion insinuation installation instatement interjection interpolation introduction investiture ordination penetration perfusion tessellation transplant transplantation