n. The act of placing on a seat; the act of furnishing with a seat or seats.n. Textile material made for upholstering the seats of chairs, sofas, and the like; especially, haircloth.n. plural In mech., collectively, the various fitted supports of the parts of a structure or of a machine.n. In ship-building, that part of the floor which rests on the keel.n. In iron ship-building, a foundation or support built up of plates and angle-bars for the machinery in the interior of a vessel: as, an engine-seating; a boiler-seating.