insertion

Universal Words noun 1 [U,C] ~ (in / into sth) the act of putting sth inside sth else; a thing that is put inside sth else: An examination is carried out before the insertion of the tube. * Acupuncture involves the insertion of needles into specific points of the body. 2 [C,U] a thing that is added to a book, piece of writing, etc.; the act of adding sth: the insertion of an extra paragraph