All 8 Uses of

graft
in
Les Miserables

There is nothing unusual in the Latin Church in these grafts of one order on another.†
Chpt 2.6 *

grafts = joins two things; or items joined; or locations of the joining

destiny, good and evil, the way of being against being, the conscience of man, the thoughtful somnambulism of the animal, the transformation in death, the recapitulation of existences which the tomb contains, the incomprehensible grafting of successive loves on the persistent I, the essence, the substance, the Nile, and the Ens, the soul, nature, liberty, necessity;†
Chpt 1.1

Ladies, a second piece of advice: do not marry; marriage is a graft; it takes well or ill; avoid that risk.†
Chpt 1.3

Nothing of this triumph reached Fauchelevent in his hut; he went on grafting, weeding, and covering up his melon beds, without in the least suspecting his excellences and his sanctity.†
Chpt 2.8

It is a whole language within a language, a sort of sickly excrescence, an unhealthy graft which has produced a vegetation, a parasite which has its roots in the old Gallic trunk, and whose sinister foliage crawls all over one side of the language.†
Chpt 4.7

Let the reader imagine Paris lifted off like a cover, the subterranean net-work of sewers, from a bird's eye view, will outline on the banks a species of large branch grafted on the river.†
Chpt 5.2

The operation was complicated; the visit entailed the necessity of cleaning; hence it was necessary to cleanse and at the same time, to proceed; to note the entrances of water, to count the gratings and the vents, to lay out in detail the branches, to indicate the currents at the point where they parted, to define the respective bounds of the divers basins, to sound the small sewers grafted on the principal sewer, to measure the height under the key-stone of each drain, and the width, at the spring of the vaults as well as at the bottom, in order to determine the arrangements with regard to the level of each water-entrance, either of the bottom of the arch, or on the soil of the street.†
Chpt 5.2

Definitions:

(1) (graft as in: skin graft)
to artificially join two things; or the smaller of the items joined; or the location of the joining

Common examples are the grafting of a plant shoot to another plant stem or the grafting of skin tissue to replace skin lost due to fire or other accident. This sense of graft can also be used metaphorically as in "graft the provision onto the legislative bill."
(2) (graft as in: graft and corruption)
corruption in which one uses their position to gain personal advantage -- especially political corruption