(1) (n.) Geology. The process of creation, transportation and deposition of sediments. See: Aggradation, Eustasy, Glauconite, Growth Fault, Milankovitch Cycles, Normal Fault, Sediment, Sequence Stratigraphy. (2) (n.) Drilling Fluids. The process of separation of the components of a cement slurry during which the solids settle. Sedimentation is one of the characterizations used to define slurry stability