n. The act of cementing; the act of uniting by an adhesive substance.n. A metallurgical process in which two substances are heated in contact for the purpose of effecting some important chemical change in one of them.n. In petrography, the cementing of fragments or grains of a porous or incoherent rock by infiltration and deposition of mineral matter from solution. The commonest cementing-materials are carbonates, silica (usually as quartz), and silicates.n. The solid fixation to extraneous objects by the substance of the shell or test, as in the entire class of corals and sporadically in the Brachiopoda, Pelecypoda, Vermes, etc.n. In botany, the growing together of the hyphæ of fungi. Same as concrescence, 4.n. A process in which two solid substances in contact, upon being heated, pass into and penetrate one another without melting.