n. In chem., the act or process of sublimating; a process by which solid substances are, by the aid of heat, converted into vapor, which is again condensed into the solid state by the application of cold.n. The act of heightening, refining, purifying, or freeing (something) from baser qualities: as, the sublimation of the affections.n. That which has been highly refined or purified; hence, the highest product of anything.