(1):

(v. t.) To subject to the process of grafting; to furnish with grafts or scions; to graft; as, to ingraft a tree.

(2):

(v. t.) To insert, as a scion of one tree, shrub, or plant in another for propagation; as, to ingraft a peach scion on a plum tree; figuratively, to insert or introduce in such a way as to make a part of something.