To set in; infix or implant.n. That which is set in; an insertion; specifically, in bookbinding, a leaf or leaves inserted in other leaves previously folded, usually in the center of the folding.n. Influx, as of the tide.n. Same as ingate, 2.To add (a leaf or leaves) within the folded sections of a book, or between the sections, as a map, a printed illustration, or an advertisement.n. A small picture or diagram inserted within the border of a larger one.