1. The keeping apart of process streams.

2. In plastics molding, a close succession of parallel, relatively narrow, and sharply defined wavy lines of color on the surface of a plastic that differ in shade from surrounding areas and create the impression that the components have separated.

The separation of alleles and homologous chromosomes during meiosis in the formation of gametes.

The formation of a secondary feature within a sediment after deposition due to chemical rearrangement of minor constituents.

The nonuniform distribution of alloying elements, impurities, or microphases, resulting in localized concentrations.